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2x(x+7)-x-10=9
We move all terms to the left:
2x(x+7)-x-10-(9)=0
We add all the numbers together, and all the variables
-1x+2x(x+7)-19=0
We multiply parentheses
2x^2-1x+14x-19=0
We add all the numbers together, and all the variables
2x^2+13x-19=0
a = 2; b = 13; c = -19;
Δ = b2-4ac
Δ = 132-4·2·(-19)
Δ = 321
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{-(13)-\sqrt{321}}{2*2}=\frac{-13-\sqrt{321}}{4} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(13)+\sqrt{321}}{2*2}=\frac{-13+\sqrt{321}}{4} $
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