SOLUTION: the height of a triangle is 3m less then the length of the base. the area is 20m what are the height and the base?

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Question 906477: the height of a triangle is 3m less then the length of the base. the area is 20m what are the height and the base?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
For a triangle,
A=%281%2F2%29bh
%281%2F2%29b%28b-3%29=20
b%28b-3%29=40
b%5E2-3b=40
b%5E2-3b-40=0
%28b-8%29%28b%2B5%29=0
Only positive solution works here,
b-8=0
b=8
Then,
h=8-3
h=5