Question

which of these identitie
is not true?
(a) (x + y)2 = x² + 2xy + y2
(b) (x - y)2 = x2 - 2xy + y2
(c) x2 - y2 = (x + y) (x - y)
(d) (x+y+z)2 = x2+ y2+ z2+3xyz​

Answer 1

Answer:

d)( x+y+z)^2=x^2+y^2+z^2+2+2xy+2zx+2zy

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

HOPE IT WILL HELPS YOU IN YOUR STUDY'S ✌️