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5x(3x+38)=180
We move all terms to the left:
5x(3x+38)-(180)=0
We multiply parentheses
15x^2+190x-180=0
a = 15; b = 190; c = -180;
Δ = b2-4ac
Δ = 1902-4·15·(-180)
Δ = 46900
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{46900}=\sqrt{100*469}=\sqrt{100}*\sqrt{469}=10\sqrt{469}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(190)-10\sqrt{469}}{2*15}=\frac{-190-10\sqrt{469}}{30} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(190)+10\sqrt{469}}{2*15}=\frac{-190+10\sqrt{469}}{30} $
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