Question

simply the given polynomial (5x2+2y+7)+(2x2+3y-1)

Answer 1

$(5x^2+2y+7)+(2x^2+3y-1)$

remove the parenthesis

$5x^2+2y+7+2x^2+3y-1$

group the posible operations

$(5+2)x^2+(2+3)y+(7-1)$

and solve

$7x^2+5y+6$