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58.904=\pi xx
Multiply both sides of the equation by 4.
58.904=\pi x^{2}
Multiply x and x to get x^{2}.
\pi x^{2}=58.904
Swap sides so that all variable terms are on the left hand side.
\frac{\pi x^{2}}{\pi }=\frac{58.904}{\pi }
Divide both sides by \pi .
x^{2}=\frac{58.904}{\pi }
Dividing by \pi undoes the multiplication by \pi .
x^{2}=\frac{7363}{125\pi }
Divide 58.904 by \pi .
x=\frac{7363}{5\sqrt{36815\pi }} x=-\frac{7363}{5\sqrt{36815\pi }}
Take the square root of both sides of the equation.
58.904=\pi xx
Multiply both sides of the equation by 4.
58.904=\pi x^{2}
Multiply x and x to get x^{2}.
\pi x^{2}=58.904
Swap sides so that all variable terms are on the left hand side.
\pi x^{2}-58.904=0
Subtract 58.904 from both sides.
x=\frac{0±\sqrt{0^{2}-4\pi \left(-58.904\right)}}{2\pi }
This equation is in standard form: ax^{2}+bx+c=0. Substitute \pi for a, 0 for b, and -58.904 for c in the quadratic formula, \frac{-b±\sqrt{b^{2}-4ac}}{2a}.
x=\frac{0±\sqrt{-4\pi \left(-58.904\right)}}{2\pi }
Square 0.
x=\frac{0±\sqrt{\left(-4\pi \right)\left(-58.904\right)}}{2\pi }
Multiply -4 times \pi .
x=\frac{0±\sqrt{\frac{29452\pi }{125}}}{2\pi }
Multiply -4\pi times -58.904.
x=\frac{0±\frac{2\sqrt{36815\pi }}{25}}{2\pi }
Take the square root of \frac{29452\pi }{125}.
x=\frac{7363}{5\sqrt{36815\pi }}
Now solve the equation x=\frac{0±\frac{2\sqrt{36815\pi }}{25}}{2\pi } when ± is plus.
x=-\frac{7363}{5\sqrt{36815\pi }}
Now solve the equation x=\frac{0±\frac{2\sqrt{36815\pi }}{25}}{2\pi } when ± is minus.
x=\frac{7363}{5\sqrt{36815\pi }} x=-\frac{7363}{5\sqrt{36815\pi }}
The equation is now solved.