Question

(5y +7) (2 y - 0,4)=a​

Answer 1

$10y^{2} -2y+14y-2,8=a\\10y^{2}+12y-2,8=a\\a=10y^{2}+12y-2,8\\a=10y^{2}+12y-2,8$

y∈R