Question

How do you simplify `2a + 5a \times 4a - a`?

Answer 1

See below.

Explanation:

We follow PEMDAS.

`5a\times4a=20a^2`

`2a+20a^2-a=a+20a^2`

Since `a` and `a^2` do not have the same power, we cannot combine them.