Suppose that f(x) = -x^2 + 2x - 5. Determine f(0).

[cecy]

Suppose that f(x)=-x²+2x-5. Determine the following: f(0)

 

[Mrspi]

Re: Function

Suppose that f(x)=-x²+2x-5. Determine the following: f(0)

You know that

f(x) = -x<SUP>2</SUP> + 2x - 5

So,
f(a) = -a<SUP>2</SUP> + 2a - 5

f(3) = -3<SUP>2</SUP> + 2(3) - 5
In this one, you can do the arithmetic on the right-hand side:
f(3) = -9 + 6 - 5
f(3) = -8

f(-2) = -(-2)<SUP>2</SUP> + 2(-2) - 5
You can do the arithmetic on the right-hand side for this one, too:
f(-2) = -4 + (-4) - 5
f(-2) = -13

Do you see what I did on each of these? Do the same thing to find f(0)....replace each "x" with the value that is inside the parentheses, and do the arithmetic.

I hope this helps you.