SOLUTION: Factor a squared minus ab minus 20b squared.

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Question 161227: Factor a squared minus ab minus 20b squared.
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
Factor a squared minus ab minus 20b squared.
:
a^2 - ab - 20b
:
Look for factors of 20 that differ by 1, then apply the necessary signs
(a + 4b)(a - 5b)
:
FOIL this to confirm the solution