If r = -2, then what is the value of the function f(r) = r³ - 4r + 8?
- 8
- 4
- 6
- None of these
Explanation
f(r) = r^3 - 4r + 8Given r = -2:
f(-2) = (-2)^3 - 4(-2) + 8
f(-2) = -8 + 8 + 8
f(-2) = 8
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