Question

Evaluate 68x72 using the identity also mention the identity used

Answer 1

Answer:

4896

Step-by-step explanation:

68 can be written as 70-2

And 72 can be written as 70+2

So, 68*72

=(70-2)(70+2)

=70^2 - 2^2

[using identity (a+b) (a-b) = a^2 -b^2]

=4900-4

=4896

Here is your answer

Hope it helps!!

Answer 2

(70-2)(70+2)

$\red{(a - b)(a + b) = {a}^{2} - {b}^{2} }$

${70}^{2} - {2}^{2} \\ 4900 - 4 = 4896$