waecmaths question:
Expand $(2x-3y)(x-5y)$
Option A:
$2{{x}^{2}}-13xy-15{{y}^{2}}$
Option B:
$2{{x}^{2}}-13xy-15{{y}^{2}}$
Option C:
$2{{x}^{2}}+13xy+15{{y}^{2}}$
Option D:
$2{{x}^{2}}-13xy+15{{y}^{2}}$
waecmaths solution:
$\begin{align} & (2x-3y)(x-5y)=2{{x}^{2}}-10xy-3xy+15{{y}^{2}} \\ & (2x-3y)(x-5y)=2{{x}^{2}}-13xy+15{{y}^{2}} \\\end{align}$
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