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5x^2+10x-9=-1
We move all terms to the left:
5x^2+10x-9-(-1)=0
We add all the numbers together, and all the variables
5x^2+10x-8=0
a = 5; b = 10; c = -8;
Δ = b2-4ac
Δ = 102-4·5·(-8)
Δ = 260
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{260}=\sqrt{4*65}=\sqrt{4}*\sqrt{65}=2\sqrt{65}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(10)-2\sqrt{65}}{2*5}=\frac{-10-2\sqrt{65}}{10} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(10)+2\sqrt{65}}{2*5}=\frac{-10+2\sqrt{65}}{10} $
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