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x^2-30x=-210
We move all terms to the left:
x^2-30x-(-210)=0
We add all the numbers together, and all the variables
x^2-30x+210=0
a = 1; b = -30; c = +210;
Δ = b2-4ac
Δ = -302-4·1·210
Δ = 60
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{60}=\sqrt{4*15}=\sqrt{4}*\sqrt{15}=2\sqrt{15}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-30)-2\sqrt{15}}{2*1}=\frac{30-2\sqrt{15}}{2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-30)+2\sqrt{15}}{2*1}=\frac{30+2\sqrt{15}}{2} $
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