Question

Задание: упростить .

Answer 1

$(3x+4y) ^{2}-(4x+3y)*(4x-3y)-25y ^{2}=9 x^{2} +24xy+16y ^{2}-$
$-(16 x^{2} -9y ^{2})-25y ^{2}=9 x^{2} +24xy+16y ^{2}-16 x^{2} +9y ^{2} -$$-25y ^{2}=-7 x^{2} +24xy=24xy-7 x^{2}$
Ответ: Е)