waecmaths question:
Solve the equation 2x2 – x – 6 = 0
Option A:
$x=-\tfrac{3}{2}\text{ or }2$
Option B:
$x=-7\text{ or }\tfrac{3}{2}$
Option C:
x = –3 or 2
Option D:
x = 3 or – 2
waecmaths solution:
$\begin{align} & 2{{x}^{2}}-x-6=0 \\ & 2{{x}^{2}}-4x+3x-6=0 \\ & 2x(x-2)+3(x-2)=0 \\ & (2x+3)(x-2)=0 \\ & x=-\tfrac{3}{2}\text{ or }x=2 \\\end{align}$
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