Answers

2015-06-22T21:15:39+08:00
Use the formula :(a+b ) ^{2} = a^{2} + 2ab +b^{2}

Sol'tn:
Distribute the numbers to the formula
(7 q^{2}w^{2} )^{2} + 2(7 q^{2}w^{2 }times -4w^{2} ) + (-4 w^{2} )

Answer will be : 49 q^{4}  w^{4} - 56 w^{2}  q^{2} + 16 w^{4}
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