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10x^2+10x-390=0
a = 10; b = 10; c = -390;
Δ = b2-4ac
Δ = 102-4·10·(-390)
Δ = 15700
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{15700}=\sqrt{100*157}=\sqrt{100}*\sqrt{157}=10\sqrt{157}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(10)-10\sqrt{157}}{2*10}=\frac{-10-10\sqrt{157}}{20} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(10)+10\sqrt{157}}{2*10}=\frac{-10+10\sqrt{157}}{20} $
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