Answers

2015-10-27T11:51:05+05:30
An identity is an equality that holds true regardless of the values chosen for its variables.
For example, the identity (a+b)^2=a^2+b^2+2ab
is always true regardless of the values of a and b .
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2015-10-27T11:56:49+05:30
(x+y)²=x²+y²+2xy
(x-y)²=x²+y²-2xy
(x+y)(x-y)=x²-y²
(x + a)(x + b) = x2 + (a + b) x + ab
(x+y)
³=x³+y³+3xy(x+y)
(x-y)³=x³-y³-3xy(x-y)
(x + y + z)2 = x2 + y2 + z2 + 2xy +2yz + 2xz
 x3 + y3 + z3 - 3xyz = (x + y + z) (x2 + y2 + z2 - xy - yz -xz)
x3 + y3 = (x + y) ( x2 - xy + y2)
 x3 - y3 = (x - y) ( x2 + xy + y2)

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