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7x^2+15x-7=0
a = 7; b = 15; c = -7;
Δ = b2-4ac
Δ = 152-4·7·(-7)
Δ = 421
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{-(15)-\sqrt{421}}{2*7}=\frac{-15-\sqrt{421}}{14} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(15)+\sqrt{421}}{2*7}=\frac{-15+\sqrt{421}}{14} $
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