Question

помогите по алгебре плизз

Answer 1

a) (7d-2)^2=49d^2-28d+4
б) (2t+5r)^2=4t^2+20rt+25r^2
в) -40qs+(4q+5s)^2=16q^2+25s^2
г) 49y^2-(3-7y)^2=3(14y-3)=42y-9
д) -3*(3a-5)^2=-27a^2+90a-75