How to find the solutions of the equation g^2-4g=45

To find the solutions to the following questions what you would need to do is to factor out the common variable or g. Which would be the following:

g (g-4) = 45

g = 45

g2 = 49

This is more of the erraneous way to find the solution for the original one factor the expression

Step-by-step explanation:

g2 - 4g - 45 = 0

(g-9) (g+5) = 0

you can figure out what the 2 roots would be.