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5x-7=-8x^2
We move all terms to the left:
5x-7-(-8x^2)=0
We get rid of parentheses
8x^2+5x-7=0
a = 8; b = 5; c = -7;
Δ = b2-4ac
Δ = 52-4·8·(-7)
Δ = 249
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{-(5)-\sqrt{249}}{2*8}=\frac{-5-\sqrt{249}}{16} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(5)+\sqrt{249}}{2*8}=\frac{-5+\sqrt{249}}{16} $
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