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x(5-3)+2=28
We move all terms to the left:
x(5-3)+2-(28)=0
We add all the numbers together, and all the variables
x2+2-28=0
We add all the numbers together, and all the variables
x^2-26=0
a = 1; b = 0; c = -26;
Δ = b2-4ac
Δ = 02-4·1·(-26)
Δ = 104
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{104}=\sqrt{4*26}=\sqrt{4}*\sqrt{26}=2\sqrt{26}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-2\sqrt{26}}{2*1}=\frac{0-2\sqrt{26}}{2} =-\frac{2\sqrt{26}}{2} =-\sqrt{26} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+2\sqrt{26}}{2*1}=\frac{0+2\sqrt{26}}{2} =\frac{2\sqrt{26}}{2} =\sqrt{26} $
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