factorise : 4(x+3y)^2 - 28(x+3y) +49 - Maths - Polynomials

Question

factorise : 4(x+3y)^2 - 28(x+3y) +49

Varun.Rawat · Accepted Answer

4x+3y2 - 28x+3y+ 49=2x+3y2 - 22x+3y7 + 72=2x+3y - 72      as, a2-2ab+b2 = a-b2=2x + 6y - 72=2x + 6y - 72x + 6y - 7