SOLUTION: Can you please help me with this i do not understand this? Solve by factoring x^2

SOLUTION: Can you please help me with this i do not understand this? Solve by factoring x^2 - 9x = -20 thank you julie

Question 118177: Can you please help me with this i do not understand this?
Solve by factoring
x^2 - 9x = -20
thank you
julie
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!

Start with the given equation

Add 20 to both sides.

Factor the left side (note: if you need help with factoring, check out this solver)

Now set each factor equal to zero:
or

or Now solve for x in each case

So our answer is
or

Notice if we graph we can see that the roots are and . So this visually verifies our answer.

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