Question

Let f(x) = x2 - 8x + 5. Find f(-1).

= 14 right ? @blurbendy

Answer 1

do i need to answer this or no?

Answer 2

yes, correct

Answer 3

it is right

Answer 4

This is how > :basically just insert -1 wherever there is an x. (I'm assuming here that x2 is x squared)

f(-1) = (-1)^2- 8(-1)+5
= 1+8+5
= 14
Any negative multiplied by a negative will give you a positive. So... -1(-1)= 1 and -8(-1)=8

Answer 5

Well NEVERMIND

Answer 6

-1^2 - 8(-1) + 5
1 - 8 + 5 = 12

Answer is 12

Answer 7

GUYS VIEW THIS FOR THE ANSWER http://www.wolframalpha.com/input/?i=f%28x%29+%3D+x2+-+8x+%2B+5.+Find+f%28-1%29.

Answer 8

\( f(-1) = -1^2 - 8(-1) + 5 \)
\( f(-1) = 1 - 8 + 5 = 12\)
\( f(-1) = 12\)


Answer is 12

Answer 9

It is 14 only if that is not a x^2 but x2, which I am thinking it is meant to be a quadratic.

Answer 10

@Gabylovesyou THe answer is 14 u are right proof http://www.wolframalpha.com/input/?i=f%28x%29+%3D+x2+-+8x+%2B+5.+Find+f%28-1%29.