– WELCOME TO

AN INTRODUCTORY VIDEO ON USING THE TI-84

GRAPHING CALCULATOR. THE GOALS OF THIS VIDEO

ARE TO BE ABLE TO TURN THE GRAPHING CALCULATOR

ON AND OFF, AND WE’LL ALSO COVER

HOW TO ENTER VARIOUS EXPRESSIONS ON THE GRAPHING CALCULATOR

INCLUDING FRACTIONS, EXPONENTS, RADICALS, SCIENTIFIC NOTATION,

AND EVALUATING EXPRESSIONS. SO LET’S GO AHEAD

AND GET STARTED. THE FIRST THING WE NEED TO KNOW HOW TO DO IS TO TURN

THE CALCULATOR ON. IN THE LOWER LEFT-HAND CORNER

THERE IS AN ON BUTTON, SO IF WE PRESS ON

THE CALCULATOR WILL TURN ON. TO TURN IT OFF WE HAVE TO PRESS

2nd AND THEN ON AGAIN. YOU CAN SEE THE OFF

RIGHT ABOVE THE ON BUTTON. SO LET’S GO AHEAD

AND TURN IT BACK ON. NOW LET’S TAKE A LOOK

AT THE MODE SETTINGS. HERE IS THE MODE BUTTON. LET’S PRESS THIS. AND THE MAIN THING

I WANT TO TALK ABOUT HERE IS THIS SECOND ROW

WHERE IT HAS THE WORD FLOAT AND THEN THE NUMBERS 0

THROUGH 9. I RECOMMEND LEAVING IT ON FLOAT. IF YOU DO SET IT TO A FIXED

NUMBER OF DECIMAL PLACES, LET’S SAY THREE, AND IF I PRESS ENTER AND THEN GO

TO THE HOME SCREEN BY PRESSING 2nd MODE FOR QUIT, IF I PRESS 3 + 2

IT’LL LOOK STRANGE. IT’LL HAVE 5.000. IT WILL ALWAYS

HAVE THREE DECIMAL PLACES TO THE RIGHT

OF THE DECIMAL POINT IF YOU HAVE IT SET

AT THREE FIXED DECIMAL PLACES. SO IF YOU GO BACK TO MODE

AND LEAVE IT ON FLOAT, PRESS DOWN, ENTER,

AND THEN QUIT, 2nd MODE, NOW IF I PRESS 2 + 3 IT WON’T

HAVE EXTRA DECIMAL PLACES, AND IT WILL ONLY INCLUDE DECIMAL

PLACES WHEN NEEDED. SO FOR EXAMPLE IF I PRESS 3/2

IT WILL RETURN 1.5. IF WE GO BACK TO THE MODE

JUST FOR A MOMENT, THERE ARE LOT

OF OTHER SETTINGS HERE, BUT FOR RIGHT NOW WE’RE ONLY

GOING TO BE DEALING WITH EXPRESSIONS, SO THAT’S THE ONLY ROW

THAT I WILL COVER. IF I WANT TO CLEAR THIS HOME

SCREEN I PRESS CLEAR HERE, AND WE’LL POSITION THE CURSOR

IN THE TOP LEFT CORNER. SO NOW LET’S TALK ABOUT

HOW WE CAN PERFORM CALCULATIONS ON THE HOME SCREEN. WORKING WITH FRACTIONS

IS VERY EASY ON THIS GRAPHING CALCULATOR. NOW THERE IS NO SPECIAL

FRACTION KEY. REMEMBER THAT A FRACTION BAR

IS JUST A DIVISION SYMBOL, SO IF I WANT TO ENTER 1/2 I WOULD JUST TYPE

IN 1 DIVIDED BY 2. NOW, IF I HIT ENTER

IT WILL CONVERT THIS FRACTION TO A DECIMAL, BUT LET’S SAY I WANT TO FIND

THE SUM OF 1/2 AND 1/3. I LIKE TO ENTER THE FRACTION

IN A SET OF PARENTHESES, SO 1 DIVIDED BY 2,

CLOSE THE PARENTHESES. THERE IS THE 1/2 + OPEN

PARENTHESIS 1 DIVIDED BY 3 CLOSE PARENTHESIS. NOW, WHEN I PRESS ENTER HERE IT WILL GIVE ME A DECIMAL

APPROXIMATION OF THIS SUM WHICH ISN’T VERY HELPFUL, BUT WE CAN CONVERT

THIS DECIMAL BACK TO A FRACTION BY PRESSING MATH, AND NOTICE HOW THE FRACTION

OPTION IS ALREADY HIGHLIGHTED. PRESS ENTER AND THEN ENTER. AND THAT SUM IS 5/6. LET’S GO AHEAD AND TRY ANOTHER. LET’S SAY WE WANT TO PERFORM

2/5, 2 DIVIDED BY 5 x 7/8. 7 DIVIDED BY 8, CLOSE IT,

PRESS ENTER. THIS WILL GIVE ME A DECIMAL. TO CONVERT THIS DECIMAL

TO A FRACTION WE PRESS MATH, ENTER, ENTER,

AND THAT WOULD BE 7/20. NEXT, IF WE WANT TO TYPE

IN EXPONENTS, THIS LITTLE CARET OR HAT

IS THE EXPONENT KEY. SO IF I WANT TO RAISE 2

TO THE POWER OF 4 I WILL PRESS THE BASE 2,

THE EXPONENT KEY, THEN THE EXPONENT 4,

AND THAT WILL GIVE US 16. NOW, IF I WANT TO TYPE

IN A FRACTIONAL EXPONENT, I NEED TO MAKE SURE I INCLUDE

THAT FRACTIONAL EXPONENT IN A SET OF PARENTHESES. SO IF I WANT TO RAISE 8

TO THE POWER 1/3 WHICH IS THE SAME

AS THE CUBE ROOT OF 8, I MUST ENTER IT THIS WAY. NEXT, LET’S TAKE A LOOK

AT RADICALS. LET’S START BY TALKING

ABOUT THE SQUARE ROOT. THE SQUARE ROOT YOU CAN SEE

RIGHT ABOVE THE X SQUARED KEY, SO IF I PRESS 2ND X SQUARED IT

BRINGS UP THE SQUARE ROOT, THEN I TYPE IN THE RADICAND,

CLOSE THE SET OF PARENTHESES, PRESS ENTER, AND THAT WILL GIVE

US THE SQUARE ROOT. NOW, FOR THE CUBE ROOT

WE CAN PRESS MATH, AND YOU CAN SEE OPTION 4 IS

A CUBE ROOT WITH AN INDEX OF 3, SO IF WE PRESS 4, OR YOU CAN

SCROLL DOWN AND HIT ENTER, I’LL PRESS 4, IT BRINGS UP

THE CUBE ROOT COMMAND. AND IF WE TYPE IN OUR RADICAND,

PRESS ENTER, IT WILL EVALUATE THAT FOR US. NOW, ANY INDEX HIGHER THAN 3

WE HAVE A DIFFERENT PROCEDURE. FOR EXAMPLE, IF WE WANT TO FIND

THE FOURTH ROOT OF 81, THE FIRST STEP IS TO TYPE

IN THE INDEX 4, PRESS MATH, AND THEN YOU CAN SEE OPTION 5

HAS AN INDEX OF X. SO IF WE SELECT OPTION 5 THIS NOTATION IS THE FOURTH ROOT

OF 81. PRESS ENTER,

AND IT EVALUATES IT. NOW LET’S GO AHEAD AND TALK

ABOUT SCIENTIFIC NOTATION. IF WE WANT TO TYPE IN 5 x 10

TO THE NEGATIVE THIRD POWER, WE PRESS 5. HERE WE SEE TWO CAPITAL E’S. THIS IS THE COMMAND

FOR SCIENTIFIC NOTATION, SO IF WE PRESS 2nd, AND NOW WE JUST TYPE

IN THE EXPONENT ON BASE 10, AND I BELIEVE I SAID 5 x 10

TO THE NEGATIVE THIRD POWER, SO I’LL TYPE IN -3. SO AGAIN, THIS MEANS 5 x 10

TO THE NEGATIVE THIRD POWER. IF I PRESS ENTER, IT WILL CONVERT IT TO A DECIMAL. I CAN ALSO MULTIPLY 2 NUMBERS

TOGETHER IN SCIENTIFIC NOTATION, SO TO ENTER 2.3 x 10 TO THE

POWER OF 4 I’LL PRESS 2nd, AND THEN JUST THE 4, CLOSE THE PARENTHESES x OPEN

PARENTHESIS 6.2, 2nd, LET’S SEE,

I’M GOING TO TYPE IN x 10 TO THE NEGATIVE 2 POWER. JUST TYPE IN THE -2, CLOSE, ENTER, NOW DEPENDING

ON THE RESULT IT MAY OR MAY NOT GIVE THE ANSWER

IN SCIENTIFIC NOTATION, SO IF YOU WANT THIS ANSWER

IN SCIENTIFIC NOTATION, YOU WOULD HAVE TO CONVERT

IT YOURSELF. LET’S TALK ABOUT HOW YOU CAN

STORE VALUES FOR VARIABLES. SO LET’S SAY, FOR EXAMPLE, I WANT TO STORE 5

FOR THE VARIABLE A. I PRESS 5. HERE’S THE STORE KEY, AND NOW I HAVE TO FIND

THE LETTER A. YOU CAN SEE THE LETTER A

IN GREEN HERE, SO I HAVE TO PRESS ALPHA,

MATH, ENTER. NOW 5 IS STORED FOR A. LET’S STORE -3 IN FOR B,

SO WE PRESS -3, STORE, AND THEN WE HAVE TO FIND

THE VARIABLE B WHICH IS HERE. SO WE PRESS ALPHA, APPS, ENTER,

AND LET’S STORE -2 IN FOR C. -2, STORE, C IS HERE,

SO ALPHA, PROGRAM, ENTER. NOW IF WE WANT TO EVALUATE

AN EXPRESSION INVOLVING THESE VARIABLES, WE CAN JUST TYPE

IN THE EXPRESSION. SO FOR EXAMPLE IF WE WANTED

TO EVALUATE B SQUARED – 4AC WHICH HAPPENS

TO BE THE DISCRIMINANT IN THE QUADRATIC FORMULA, WE CAN JUST TYPE IN B

WHICH IS ALPHA APPS SQUARED. WE CAN HIT THIS CARET

AND THEN 2, OR THERE IS A SQUARED KEY

HERE – 4AC. A IS ALPHA, MATH,

AND C IS ALPHA, PROGRAM. PRESS ENTER, AND OUR

DISCRIMINANT WOULD BE 49. FOR THIS EXPRESSION,

B SQUARED – 4AC IS EQUAL TO 49. THIS IS A NICE WAY

TO CHECK YOUR WORK WHEN YOU’RE EVALUATING

EXPRESSIONS. I HOPE YOU FOUND THIS

INTRODUCTORY VIDEO HELPFUL. THANK YOU FOR WATCHING.