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3x(x+10)=15
We move all terms to the left:
3x(x+10)-(15)=0
We multiply parentheses
3x^2+30x-15=0
a = 3; b = 30; c = -15;
Δ = b2-4ac
Δ = 302-4·3·(-15)
Δ = 1080
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{1080}=\sqrt{36*30}=\sqrt{36}*\sqrt{30}=6\sqrt{30}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(30)-6\sqrt{30}}{2*3}=\frac{-30-6\sqrt{30}}{6} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(30)+6\sqrt{30}}{2*3}=\frac{-30+6\sqrt{30}}{6} $
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