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6750=-x(x-465)
We move all terms to the left:
6750-(-x(x-465))=0
We calculate terms in parentheses: -(-x(x-465)), so:We get rid of parentheses
-x(x-465)
We multiply parentheses
-x^2+465x
We add all the numbers together, and all the variables
-1x^2+465x
Back to the equation:
-(-1x^2+465x)
1x^2-465x+6750=0
We add all the numbers together, and all the variables
x^2-465x+6750=0
a = 1; b = -465; c = +6750;
Δ = b2-4ac
Δ = -4652-4·1·6750
Δ = 189225
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{189225}=435$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-465)-435}{2*1}=\frac{30}{2} =15 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-465)+435}{2*1}=\frac{900}{2} =450 $
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