Ответ:

Объяснение:

1) =16х^2-40x+25

2)= 25a^2+70ab+49b^2

[tex]\displaystyle\bf\\1)\\\\\Big(4x-5\Big)^{2} =\Big(4x\Big)^{2} -2\cdot 4x\cdot 5+5^{2}=\boxed{16x^{2} -40x+25}\\\\\\2)\\\\\Big(5a+7b\Big)^{2} =\Big(5a\Big)^{2} +2\cdot 5a\cdot 7b+\Big(7b\Big)^{2} =\boxed{25a^{2} +70ab+49b^{2} }[/tex]