If f(x) = x² - 4x then f(4)-f(2) equals?
- 2
- 3
- 4
- None of these
Explanation
f(x) = x² - 4x
f(4) = 4² - 4(4) = 16 - 16 = 0
f(2) = 2² - 4(2) = 4 - 8 = -4
f(4) - f(2) = 0 - (-4) = 4
Last verified on 25-05-2026
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