The answer to this is 5√2
6 less than 2 and a number.
Definition of a rational number:
A rational number is a number that can be written as fraction of integers.
19/10 is a fraction.
19 and 10 are integers.
19/10 follows exactly the definition of a rational number, so it is rational.
We have the equation:

So then we need to distribute -7p to the parentheses:

Then we need to set the equation equal to 0, so we must subtract 21 on both sides:

Then we need to factor this. So we end up with:

This is as much as this can be factored, so <u>we cannot go any further</u>.