Question

Which of the following identities can be used to factorise $x^2+12x+36$?

• A. $(x-a{)}^2$
• B. $(x+a{)}^2$
• C. $(x^2-a^2)$
• D. None of the above.

Answer 1

The correct option is B $(x+a{)}^2$

Given: $x^2+12x+36$.

Since, the last number of the given expression is a perfect square, we can use the identity $(x+a{)}^2=x^2+2xa+a^2$ where, $a=6$.