Question

(ax+by)²+(bx-ay)² factorise​

Answer 1

here is the answer

(ax+by)^2+(bx+ay)^2

a^2.x^2+b^2.y^2+2axby+b^2.x^2+a^2.y^2+2axby

a^2(x^2+y^2)+b^2(x^2+y^2)+4axby

(x^2+y^2)(a^2+b^2)+4axby