SOLUTION: x^2 + 9x + 20 =(x + 1)(x + 20) Is this right?

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Question 78935: x^2 + 9x + 20 =(x + 1)(x + 20)
Is this right?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
x^2 + 9x + 20
Note: I'll use the AC method to factor the trinomial.
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To factor you should look for two numbers whose product is 20
and whose sum is 9.
The numbers are 4 and 5.
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Rewrite the problem as followsreplacing the 9x by 4x+5x to get:
x^2+4x+5x+20
Factor and 1st two terms and the last two terms separately to get:
x(x+4)+5(x+4)
Factor out the common factor to get:
(x+4)(x+5
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Cheers,
Stan H.