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x^2+13x+40

factor the expression x2-22x+40
 

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Francisco E. | Francisco; Civil Engineering, Math., Science, Spanish, Computers.Francisco; Civil Engineering, Math., Sci...
5.0 5.0 (1 lesson ratings) (1)
1
x2-22x+40
(X-20)*(X-2) =0
Roots X1 = 20
X2 = 2
Suneil P. | Knowledgeable and Passionate University of Pennsylvania Math TutorKnowledgeable and Passionate University ...
5.0 5.0 (25 lesson ratings) (25)
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x^2+13x+40=x2+5x+8x+40=x(x+5)+8(x+5)=(x+8)(x+5)
Ellen S. | Math and Writing GeekMath and Writing Geek
4.8 4.8 (79 lesson ratings) (79)
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Also, you have two different equations there. If you wanted to factor the first one (the one with 13 in it) you'd need to find two numbers that multiply together to give 40 AND add together to get 13. When I look for that combination, I find 8 and 5. So one of your factors is (x+8) and the other one is (x+5).
 
hope that helps!