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x(2x-7)-4x+14=0
We add all the numbers together, and all the variables
-4x+x(2x-7)+14=0
We multiply parentheses
2x^2-4x-7x+14=0
We add all the numbers together, and all the variables
2x^2-11x+14=0
a = 2; b = -11; c = +14;
Δ = b2-4ac
Δ = -112-4·2·14
Δ = 9
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{9}=3$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-11)-3}{2*2}=\frac{8}{4} =2 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-11)+3}{2*2}=\frac{14}{4} =3+1/2 $
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