1) 7(x - 3) + 10x(3 - x) =
= 7(x - 3) - 10x(x - 3) =
= (x - 3)(7 - 10x)
2) 4(x - 5) - (5 - x)² =
= 4(x - 5) + (x - 5)² =
= 4²(x - 5) =
= 16(x - 5)
Объяснение:
7(x-3)+10x(3-x)=(x-3)*(7-10x)
4(x-5)-(5-x)^2=(x-5)*(9-x)
