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15,12,7=x2

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Solution for 15,12,7=x2 equation:



15.12.7=x2
We move all terms to the left:
15.12.7-(x2)=0
We add all the numbers together, and all the variables
-1x^2+10.584=0
a = -1; b = 0; c = +10.584;
Δ = b2-4ac
Δ = 02-4·(-1)·10.584
Δ = 42.336
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}

x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-\sqrt{42.336}}{2*-1}=\frac{0-\sqrt{42.336}}{-2} =-\frac{\sqrt{}}{-2}
x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+\sqrt{42.336}}{2*-1}=\frac{0+\sqrt{42.336}}{-2} =\frac{\sqrt{}}{-2}

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