Question

Find the product mentally.

(z - 12)(z + 12)

z2 - 144
z2 - 24z - 144
z2 + 144

Answer 1

the answer should be z2-144

Answer 2

`z^2-144`

Explanation:

Here the given expression,

`(z-12)(z+12)`

∵ By using the algebraic property,

`(a+b)(a-b)=a^2-b^2`

We get,

`(z-12)(z+12)=(z)^2 - (12)^2`

`\implies (z-12)(z+12)=z^2-144`

Which is the required product.

Therefore, FIRST option is correct.