Question

using the identities solve 86x94​

Answer 1

Answer:

86x94=(90-4)(90+4)=(a+b)(a-b)=a square-b square

a=90

b=4

90 square-4 square

=8100-16=8084

Answer 2

Question:-

• Solve using identities, 86x94

Solution:-

We know that,

$\sf(x + y)(x - y) = {x}^{2} - {y}^{2}$

Using this identity, we will solve the given problem.

Here

86 can be written as 86=90-4

Also, 94 can be written as 94=90+4

So,

$\sf 86 \times 94$

$\sf = (90 - 4)(90 + 4)$

$\sf = {90}^{2} - {4}^{2}$

$\sf = 8100 - 16$

$\sf = 8084$

Hence, the required answer is 8084.