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(x-1)(x-2)=(7x-17)
We move all terms to the left:
(x-1)(x-2)-((7x-17))=0
We multiply parentheses ..
(+x^2-2x-1x+2)-((7x-17))=0
We calculate terms in parentheses: -((7x-17)), so:We get rid of parentheses
(7x-17)
We get rid of parentheses
7x-17
Back to the equation:
-(7x-17)
x^2-2x-1x-7x+2+17=0
We add all the numbers together, and all the variables
x^2-10x+19=0
a = 1; b = -10; c = +19;
Δ = b2-4ac
Δ = -102-4·1·19
Δ = 24
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{24}=\sqrt{4*6}=\sqrt{4}*\sqrt{6}=2\sqrt{6}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-10)-2\sqrt{6}}{2*1}=\frac{10-2\sqrt{6}}{2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-10)+2\sqrt{6}}{2*1}=\frac{10+2\sqrt{6}}{2} $
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