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(2x+3)(x-2)=9
We move all terms to the left:
(2x+3)(x-2)-(9)=0
We multiply parentheses ..
(+2x^2-4x+3x-6)-9=0
We get rid of parentheses
2x^2-4x+3x-6-9=0
We add all the numbers together, and all the variables
2x^2-1x-15=0
a = 2; b = -1; c = -15;
Δ = b2-4ac
Δ = -12-4·2·(-15)
Δ = 121
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{121}=11$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-1)-11}{2*2}=\frac{-10}{4} =-2+1/2 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-1)+11}{2*2}=\frac{12}{4} =3 $
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