1.

Find the expansion of (x+y-1)³

Answer»

ANSWER:

Step-by-step explanation:

Using the identity (a+b+c)^2=a^2+b^2+c^2+2(ab+bc+ac)

Here,

a=X

b=y

c=-1

APPLYING THE IDENTITY,  [(a+b+c)^2=a^2+b^2+c^2+2(ab+bc+ac)]

x^2 + y^2 + 1 + 2(XY+(-y)+(-x))

x^2 + y^2 + 1 + 2(xy-y-x)

OR,

x^2 + y^2 + 1 + 2xy- 2Y- 2x

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