Question

12. Using suitable identity, expand the following
(a) (2x - 3y) 3
(b) (2x - y + z)?​

Answer 1

Answer:

a) (2x)3-3(2x)2(3y)+3(2x)(3y)2-(3y)3

=8x3-36x2y+5yxy2-27y3

b). 2x)2+(-y)2+z2+2(2x)(-y)+2(-y)z+2z(2x)

=4x2+y2+z2-4xy-2yz+4zx