Question

решите пожайлуста пошагово(4х-3у)(4х+3у)+(3х+4у)(4у-3х)

Answer 1

(4х-3у)(4х+3у)+(3х+4у)(4у-3х)=4x4x+4x3y-3y4x-3y3y+3x4y+4y4y-3x3y-4y3x=16x^2+12xy-12xy-9y^2+12xy-9x^2+16y^2-12xy=7x^2+7y^2=7(x^2+y^2)