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0=63000x-7x^2
We move all terms to the left:
0-(63000x-7x^2)=0
We add all the numbers together, and all the variables
-(63000x-7x^2)=0
We get rid of parentheses
7x^2-63000x=0
a = 7; b = -63000; c = 0;
Δ = b2-4ac
Δ = -630002-4·7·0
Δ = 3969000000
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{3969000000}=63000$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-63000)-63000}{2*7}=\frac{0}{14} =0 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-63000)+63000}{2*7}=\frac{126000}{14} =9000 $
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