Question

simplify (px+qy)^2 - (qx+py)^2​

Answer 1

Answer:

=x^2(p^2-q^2)-y^2(p^2-q^2)

Step-by-step explanation:

((p^2x^2+2pqxy+q^2y^2-q^2x^2-2pqxy-p^2y^2))

=p^2x^2+q^2y^2-q^2x^2-p^2y^2

=x^2(p^2-q^2)-y^2(p^2-q^2)