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5x(x-1)=5x*2-(8-3x)
We move all terms to the left:
5x(x-1)-(5x*2-(8-3x))=0
We add all the numbers together, and all the variables
5x(x-1)-(5x*2-(-3x+8))=0
We multiply parentheses
5x^2-5x-(5x*2-(-3x+8))=0
We calculate terms in parentheses: -(5x*2-(-3x+8)), so:We get rid of parentheses
5x*2-(-3x+8)
Wy multiply elements
10x-(-3x+8)
We get rid of parentheses
10x+3x-8
We add all the numbers together, and all the variables
13x-8
Back to the equation:
-(13x-8)
5x^2-5x-13x+8=0
We add all the numbers together, and all the variables
5x^2-18x+8=0
a = 5; b = -18; c = +8;
Δ = b2-4ac
Δ = -182-4·5·8
Δ = 164
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{164}=\sqrt{4*41}=\sqrt{4}*\sqrt{41}=2\sqrt{41}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-18)-2\sqrt{41}}{2*5}=\frac{18-2\sqrt{41}}{10} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-18)+2\sqrt{41}}{2*5}=\frac{18+2\sqrt{41}}{10} $
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