Youssef H.

asked • 10/03/16

How to factor?

u^2-8u-9 thanks

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Inactive Tutor answered • 10/03/16

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u2 - 8u - 9
 
Find two numbers that when multiplied give -9, and when added give -8.  The numbers are -9 and 1.  Then the factored expression is
 
[u + (-9)] (u + 1) = (u - 9)(u + 1)
 
Test this by multiplying it out.
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Inactive Tutor

If you cannot find the two numbers, then solve the quadratic equation, get two answers r1 and r2, and the factored expression is
 
(u - r1)(u - r2)
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10/03/16

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