Question

Show that :(2r-3s)(2r+3s)+(3s-4q)(3s+4q)+(4q-2r)(4q+2r)=0

Answer 1

Answer:

4r^2+6rs-6rs-9s^2+9s^2+12qs-12qs-16q^2+16q^2+8qr-8qr-4r^2

if we solve it further all will cancel each other and result comes out to be zero

hence proved