Question

using the identity evaluate 71 square​

Answer 1

Explanation:

(7+1)^2

= 70^2+2×70×1+1

= 4900+140+1

= 5041

ur answer......:)

Answer 2

An identity is true only for certain values of its variables. An equation is not an identity

The following are the identities

(a+b)sq. =a sq. +2ab+b sq.

(a-b) sq. =a sq. - 2ab- b sq.

(a-b) (a+b) = a sq. - b sq.

Another useful identity is

(x+a) (x+b) =x sq. + (a+b) x + ab

if the given expression is the difference of two squares we use the formula

a sq. - b sq. = (a+b) (a-b)

The above four identities are useful in carrying out squares and products of algebaric expressions. They also allow easy alternative methods to calculate products of no. and so on.