Ok, here goes. this is a function question?

Question

given f(x)= 5x^2 - 3x+1, find f(-2)
I am thinking that i replace x with -2 right? then go from there. this is so confusing. im 30 yr, i know i should of paid more attention in high school.

i plugged in -2 and i ended up with -13, and 27. now im really confused.

Answer 1

Yes you're correct - just plug in -2 for x to get:

20 - -6 + 1 = 27

Answer 2

It's ok. I had to do most of the "high school" math twice. Now I am a Math major :)

think of the f(x) as a graph of all possible values of x, hence the "x"

when you want to evaluate a function at a point, you replace the "x" with whatever the constant is (can be letters or numbers)

your problem f(-2) = 5(-2)^2-3(-2)+1; we are evaluating the function at the point x= -2

hope this helps

Answer 3

15

Answer 4

Yes, you replace x with -2:

5*(-2)^2 - 3*(-2) + 1

Answer 5

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Answer 6

f(x)=5x^2 - 3x+1
f(-2)=5*(-2)^2-3*(-2)+1
f(-2)=5*4+6+1=27

Answer 7

You are correct, replace x with -2

Instead of giving you the answer, which you seem to want to work out, I'll tell you instead that f(-3) = 55

Answer 8

5(-2)^2 - 3(-2)+1
5(4) -3(-2)+1
20- -6+1
20+6+1
27

Answer 9

f(x)= 5x^2 - 3x+1
f(-2) = 5 * (-2)^2 - 3 * (-2) + 1
f(-2) = 5 * 4 - (-6) + 1
f(-2) = 20 + 6 + 1
f(-2) = 27

Answer 10

f(-2)=(5*-2^2)-(3*-2)+1
f(-2)=(5*4)-(3*-2)+1
f(-2)=20-(-6)+1
f(-2)=20+6+1= +27