SOLUTION: http://imgur.com/wLihix5 I'm completely stumped. Please help me!

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: http://imgur.com/wLihix5 I'm completely stumped. Please help me!      Log On


   

Question 840773: http://imgur.com/wLihix5
I'm completely stumped. Please help me!
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Stumped? Really.
Area of a triangle is A=%281%2F2%29bh
%281%2F2%29%28x%2B20%29x=78
x%5E2%2B20x=156
x%5E2%2B20x-156=0
%28x-6%29%28x%2B26%29=0
Two solutions but only the positive one makes sense in this problem.
x-6=0
x=6
x%2B20=6%2B20=26