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(x)(x-2)=8.75
We move all terms to the left:
(x)(x-2)-(8.75)=0
We add all the numbers together, and all the variables
x(x-2)-8.75=0
We multiply parentheses
x^2-2x-8.75=0
a = 1; b = -2; c = -8.75;
Δ = b2-4ac
Δ = -22-4·1·(-8.75)
Δ = 39
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-2)-\sqrt{39}}{2*1}=\frac{2-\sqrt{39}}{2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-2)+\sqrt{39}}{2*1}=\frac{2+\sqrt{39}}{2} $
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