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OpenStudy (anonymous):
4x(x+9)=5x+45; 4x^2+36x=5x+45; 4x^2+31x-45=0 and now Im stuck
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OpenStudy (anonymous):
you need to do the quadratic formula or factor (x = (-b+-sqrt(b^2 - 4ac))/2a)
OpenStudy (anonymous):
I cant find out what two numbers multiplied are equal to -45 but have a sum of 31
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