Question

Simplify the following products by expressing these as a difference of two squares. 68×72

Answer 1

Answer:

68 x 72 = (70– 2) x (70+2) = (70-2) (70+2)

From Identity,

(a - b)(a + b) = a^2 - b^2. where a=70 and b= 2

68x72= 70^2 - 2^2

Answer 2

Answer:

4896

Step-by-step explanation:

68×72

(70-2)(70+2)

Identity- (a+b)(a-b)=a²- b²

70²- 2²

= 4900 - 4

= 4896