Question

помогите пж!!!!!!!!!​

Answer 1

Ответ:

1)(m-5)²=(m-5)(m-5)=m²-5m-5m+25=m²-10m+25

2)(2a+7b)²=(2a+7b)(2a+7b)=4a²+14ab+14ab+49b²=4a²+28ab+49b²

3)(a+3)(a-3)=a²-3a+3a-9=a²-9

4)(8x+5y)(5y-8x)=40xy-64x²+25y²-40xy= -64x²+25y²