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3x(5-3)-4x=5
We move all terms to the left:
3x(5-3)-4x-(5)=0
We add all the numbers together, and all the variables
3x2-4x-5=0
We add all the numbers together, and all the variables
3x^2-4x-5=0
a = 3; b = -4; c = -5;
Δ = b2-4ac
Δ = -42-4·3·(-5)
Δ = 76
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{76}=\sqrt{4*19}=\sqrt{4}*\sqrt{19}=2\sqrt{19}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-4)-2\sqrt{19}}{2*3}=\frac{4-2\sqrt{19}}{6} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-4)+2\sqrt{19}}{2*3}=\frac{4+2\sqrt{19}}{6} $
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