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7X^2-72X=0
a = 7; b = -72; c = 0;
Δ = b2-4ac
Δ = -722-4·7·0
Δ = 5184
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{5184}=72$$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-72)-72}{2*7}=\frac{0}{14} =0 $$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-72)+72}{2*7}=\frac{144}{14} =10+2/7 $
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