Question

How do you factor and solve `(a+1)(a+2) = 0`?

Answer 1

`a=-1` or `a=-2`.

Explanation:

`(a+1)(a+2)=0` is already factorized into `(a+1)` and `(a+2)`.

As product of `(a+1)` and `(a+2)` is zero, it means

either `a+1=0` or `a+2=0`

i.e either `a=-1` or `a=-2`.