The first rule of factoring is to try to factor a common factor from all the terms. In this case, there is no common factor.
Now we factor the trinomial.
This quadratic trinomial is of the form
x^2 + ax + b = 0
where the coefficient of the x^2 term is 1.
To factor it, find two numbers that multiply to "b", the constant term,
and add to "a", the coefficient of x.
The numbers are -5 and 2 since -5 * 2 = -10, and -5 + 2 = -3.
Now we write two sets of parentheses with x on the left side:
(x )(x ) = 0
We fill in the parentheses with the two numbers we found above, -5 and 2.
(x - 5)(x + 2) = 0
That is the factoring.
