Question

What is the value of the expression –5x4 when x = –2?









A.
–80







B.
80







C.
–40







D.
40

Answer 1

@iGreen

Answer 2

@sammixboo

Answer 3

@mathstudent55

Answer 4

@marylou004

Answer 5

i think you typed that wrong. looks just like -5 times 4

Answer 6

x = -2

\(-5x^{4}\)

\(-5(-2)^4\)

Okay, the exponent is on -2.

So multiply \(-2 \times -2\) first.

Answer 7

Does it look like this?

\(-5x^4\)?

Answer 8

high 4 lol

Answer 9

@sammixboo I'm pretty sure, his last question was about exponents.

Answer 10

yes!!!

Answer 11

Yep, that gives us -5(4).

So can you multiply that?

Answer 12

OK so if x = -2, plug in the value(s) :)

\(-5x^4\)
\(-5\times-2^4\)

So first do the exponent, \(-2^4\) = -2 x -2 x -2 x -2

Answer 13

So what is -2 x -2 x -2 x -2?

Answer 14

Solve it @chosenmatt

Answer 15

Ugh, stupid OS, my comments are lagging -.-

Answer 16

Um, I thought it was \(-2^4\), not \(-2^2\)

Answer 17

Oops, that's -2 x -2 x -2 x -2 >.>

My brain feels like sludge today..

Answer 18

I'm signing off, see ya guys!

Answer 19

-20?

Answer 20

Well you should know about Pemdas,Solving exponents comes first
SO,
-2^4 and then multiply the answer by -5

Answer 21

@chosenmatt It's going to be positive.

Answer 22

40

Answer 23

Mm try again :)

Answer 24

-2^4 =-16

Answer 25

yeah ositive 40

Answer 26

POSITIVE LOL

Answer 27

answer choices is
A.
–80







B.
80







C.
–40







D.
40

Answer 28

@sammixboo

Answer 29

Can you tell me what is -2 x -2 x -2 x -2 is first?

Answer 30

is it negative 40? @sammixboo

Answer 31

Nope, the answer is positive

Answer 32

-16*-5 =