Question

упростите выражение
1.(x-4)^2-16
2.10a+(a-5)^2
3.(3m-7n^)2-(3m+7n)^2

Answer 1

1.(x-4)^2-16=(x-4-4)(x-4+4)=x(x-8)
2.10a+(a-5)^2=10a+a²-10a+25=a²+25
3.(3m-7n^)2-(3m+7n)^2=(3m-7n-3m-7n)(3m-7n+3m+7n)=-14n*6m=-84mn

Answer 2

точно правильно????????????