# Lesson 135 – Doodles Do Algebra

Today your child extends the concepts of square roots to unknowns. The only point you really need to make sure your child understands is that 2 times 2 is the same as negative 2 times negative 2, the answer is 4. So that means that the square root of 4 could be a positive or a negative 2, we cannot tell so you have to write both possibilities down as the answer.

1. $+-2ax$
2. $+-4bx^2$
3. $+-3a^2bx$
4. $+-9m^2by^2$