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5-x2=3+4x+5
We move all terms to the left:
5-x2-(3+4x+5)=0
We add all the numbers together, and all the variables
-x2-(4x+8)+5=0
We add all the numbers together, and all the variables
-1x^2-(4x+8)+5=0
We get rid of parentheses
-1x^2-4x-8+5=0
We add all the numbers together, and all the variables
-1x^2-4x-3=0
a = -1; b = -4; c = -3;
Δ = b2-4ac
Δ = -42-4·(-1)·(-3)
Δ = 4
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{4}=2$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-4)-2}{2*-1}=\frac{2}{-2} =-1 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-4)+2}{2*-1}=\frac{6}{-2} =-3 $
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