Question

(2y2-3ay+4a2)-(ay-5y2-a2)

Answer 1

$(2y^2 - 3ay + 4a^2) - (ay - 5y^2 - a^2) \\ \\ \\ 2y^2 - 3ay + 4a^2 - ay + 5y^2 + a^2 \\ \\ => 7y^2 - 4ay + 5a^2$