waecmaths question:
Expand the expression $(3a-xy)(3a+xy)$
Option A:
$9{{a}^{2}}-{{x}^{2}}{{y}^{2}}$
Option B:
$9{{a}^{2}}+{{x}^{2}}{{y}^{2}}$
Option C:
$9{{a}^{2}}-xy$
Option D:
$9{{a}^{2}}+{{x}^{2}}y$
waecmaths solution:
$(3a-xy)(3a+xy)=9{{a}^{2}}-{{x}^{2}}{{y}^{2}}$
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