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7x^2+3x-13=0
a = 7; b = 3; c = -13;
Δ = b2-4ac
Δ = 32-4·7·(-13)
Δ = 373
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(3)-\sqrt{373}}{2*7}=\frac{-3-\sqrt{373}}{14} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(3)+\sqrt{373}}{2*7}=\frac{-3+\sqrt{373}}{14} $
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