Question 43

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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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