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(x+2)(x-3)=-6x
We move all terms to the left:
(x+2)(x-3)-(-6x)=0
We get rid of parentheses
(x+2)(x-3)+6x=0
We multiply parentheses ..
(+x^2-3x+2x-6)+6x=0
We get rid of parentheses
x^2-3x+2x+6x-6=0
We add all the numbers together, and all the variables
x^2+5x-6=0
a = 1; b = 5; c = -6;
Δ = b2-4ac
Δ = 52-4·1·(-6)
Δ = 49
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{49}=7$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(5)-7}{2*1}=\frac{-12}{2} =-6 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(5)+7}{2*1}=\frac{2}{2} =1 $
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