You can do this:
So if you know how to do quadratic equations, you must have a 3 and a 1 in the brackets to achieve the
Therefore your looking at:
Obviously the factors of 1, is 1 and itself so you can get:
Now about the signs, you need a + 1, so you need either 2 +'s or 2 -'s, seeing as you have -4 in the middle you can achieve this with 2 -'s
Strictly speaking, "0.33" is NOT a correct answer- is.
0.33 is only approximately equal to 1/3.
Also, you should understand that you could have checked these by simply substituting you answers into the given equation.
If x= 1, then and .
And, as others have pointed out, if a polygon can be factored, that is a better way of solving it than using a formula.