Question

дам 100 баллов пжж по скорее​

Answer 1

$a^2-ab-2a+2b = a\cdot (a-b)-2\cdot (a-b)=(a-b)\cdot (a-2)$

$(7x+y)^2=(7x+y)\cdot (7x+y)=(7x)^2+2\cdot 7x \cdot y +y^2=49x^2+14xy+y^2$

$25-4y^2=5^2-(2y)^2=(5-2y)\cdot(5+2y)$

Answer 2

a²-ab-2a+2b=a(a-b)-2(a-b)=(a-b)(a-2)

(7x+4)²=(7x)²+2*7x*4+4²=49x²+56x+16

25-4y²=5²-2²y²=5²-(2y)²=(5-2y)(5+2y)