Question

помогите срочно пожалуйста

Answer 1

а) 49d²-28d+4
б)4t²+20tr+25t²
в)-40qs+16q²+40qs+25s²=16q²+25s²
г)49y²-(9-42y+49y²)=49y²-9+42y-49y²=42y-9
д)-3 * (9a²-30a+25)= -27a²+90a-75

Answer 2

1)(7d-2)²=(7d)²-2.7d.2+2²=49d²-28d+4
2)(2t+5r)²=4t²+20tr+25r²
3)-40qs+(4q+5s)²=-40gs+16q²+40qs+25s²=16q²+25s²
4)49y²-(3-7y)²=(7y)²-(3-7y)²=(7y+3-7y)(7y-3+7y)=3(14y-3)=42y-9
5)-3.(3a-5)²=-3(9a²-30a+25)=-27a²+90a-75