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OpenStudy (anonymous):
4x(x+9)=5x+45; 4x^2+36x=5x+45; 4x^2+31x-45=0 And now I'm stuck...
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jimthompson5910 (jim_thompson5910):
You could factor, but I recommend using the quadratic formula to solve 4x^2+31x-45=0 for x
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