Mathematics ACT Aspire Practice Test 2025 – Complete Study Resource

Question: 1 / 400

If f(x) = x^2 + 2x, what is f(-1)?

-1

To find the value of f(-1) given the function f(x) = x^2 + 2x, you need to substitute -1 into the function for x.

Start by calculating f(-1):

1. Substitute -1 into the function:

f(-1) = (-1)^2 + 2(-1)

2. Calculate (-1)^2, which equals 1.

3. Next, calculate 2*(-1), which equals -2.

4. Now add these two results together:

f(-1) = 1 - 2 = -1.

Therefore, f(-1) evaluates to -1. The correct answer reflects this computation.

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