1.

7\left(a^{2}+b^{2}\right)^{2}-15\left(a^{4}-b^{4}\right)+8\left(a^{2}-b^{2}\right)^{2}

Answer»

7a*a*a*a+14a*a*b*b+7b*b*b*b-15a*a*a*a+15b*b*b*b+8a*a*a*a-16a*a*b*b+8b*b*b*b=30*b*b*b*b-2a*a*b*b=2*b*b(15b*b-a*a)


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