Question

$(x {}^{4} + y ^{7} ) {}^{2}$
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Answer 1

$(x^{4} +y^{7} )^{2} =(x^{4} )^{2} +2x^{4} y^{7} +(^{7} )^{2} =x^{8} +2x^{4} y^{7} +y^{14}$