Use the formula :(a+b )[tex] ^{2} = a^{2} + 2ab +b^{2} [/tex]
Sol'tn:
Distribute the numbers to the formula
(7[tex] q^{2}w^{2} )^{2} + 2(7 q^{2}w^{2 }times -4w^{2} ) + (-4 w^{2} )[/tex]
Answer will be : 49[tex] q^{4} w^{4} - 56 w^{2} q^{2} + 16 w^{4} [/tex]
