Question

Factorise
`x^(2) - 121`

Answer 1

(x-11)(x+11)

Explanation:

x^2 -121

x^2 -11^2

This is the difference of squares a^2 - b^2 = (a-b)(a+b)

(x-11)(x+11)

Answer 2

(x+11)(x-11)

Explanation:

Hello!

We are given the expression x²-121, and we want to factor it

The expression is a difference of squares expression.

The formula for the difference of squares is written as a²-b² can be factored as (a-b)(a+b)

121 is 11 squared, and x² is x squared

So that means that a=x, and b=11 in this case

Now substitute those values into the formula

a²-b²=x²-121=(x+11)(x-11)

Hope this helps!