Simplify completely X2 + 4x - 45 : x2 + 10x + 9 and find the restrictions on the variable

Answer: (x-5) / (x+1) and x cannot equal - 1 because the denominator can't be zero.

Step-by-step explanation:

Factor the numerator:

(x+9) (x-5)

Factor the denominator:

(x+1) (x+9)

So you have

(x+9) (x-5) / (x+1) (x+9); see that you can cross out the (x+9) in both the numerator and denominator?

You're left with (x-5) / (x+1)

The only number that is restricted is - 1, because that would make the denominator zero, which is a no no!