Question

ALGERIC IDENTITIES FOR CLASS 8​

Answer 1

Step-by-step explanation:

An identity is an equality, which is true for all values of the variables in the equality.

On the other hand, an equation is true only for certain values of its variables. An equation is not an

identity.

The following are the standard identities:

(a + b)2= a2+ 2ab + b2--(I)

(a – b)2= a2– 2ab + b2--(II)

(a + b) (a – b) = a2– b2--(III)

 Another useful identity is (x + a) (x + b) = x2+ (a + b) x + ab --(IV)

The above four identities are useful in carrying out squares and products of algebraic expressions.

They also allow easy alternative methods to calculate products of numbers and so on.