Jambmaths question:
Evaluate $\int_{1}^{2}{(6{{x}^{2}}-2x)dx}$
Option A:
16
Option B:
13
Option C:
12
Option D:
11
Jamb Maths Solution:
$\begin{align} & \int_{1}^{2}{(6{{x}^{2}}-2x)dx}=[2{{x}^{3}}-{{x}^{2}}]_{1}^{2} \\ & =[2{{(2)}^{3}}-{{2}^{2}}]-[2{{(1)}^{3}}-{{1}^{2}}] \\ & =12-1 \\ & =11 \end{align}$
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