Question

Помогите пжпжпжпжпжпжпжпжпж

Answer 1

(m - 5)²=m²-2*m*5 + 5² = m²-10+25

(2a + 7b)²= 4a²+28b²+49b²

(a + 3)(a - 3)=a²-3²= a²-9

(8x + 5y)(5y - 8x) = (5y-8x)(5y+8x) = 5y²-8x²= 49y²-64x²