Expand y = (x + 2)(x - 1)
y = x(x - 1) + 2(x - 1)
y = x2 - x + 2x - 2
y = x2 + x - 2
Then differentiate
$\frac{dy}{dx}$ = 2x + 1
johnmulu answered the question on March 8, 2017 at 05:05
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