5x^2+12x=100

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Solution for 5x^2+12x=100 equation:



5x^2+12x=100
We move all terms to the left:
5x^2+12x-(100)=0
a = 5; b = 12; c = -100;
Δ = b2-4ac
Δ = 122-4·5·(-100)
Δ = 2144
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:
$\sqrt{\Delta}=\sqrt{2144}=\sqrt{16*134}=\sqrt{16}*\sqrt{134}=4\sqrt{134}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(12)-4\sqrt{134}}{2*5}=\frac{-12-4\sqrt{134}}{10} $
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(12)+4\sqrt{134}}{2*5}=\frac{-12+4\sqrt{134}}{10} $

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