Question

3.Factorise
49x^2+y^2+4z^2+14xy -4yz - 28zx

Answer 1

Answer:

49x^2+y^2+4z^2+14xy -4yz - 28zx

formula = (x+y+z)^2 = ( x^2+y^2+z^2+2xy+2yz+2zx)

=(7x)^2+(y)^2+(-2z)^2+2(7x)(y)+2(y)(-2z)+2(-2z)(7x)

=(7x+y-2z)^2

= (7x+y-2z)(7x+y-2z) Answer............