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-9(3x+10)+x2=3(-6x+10)-9x+1
We move all terms to the left:
-9(3x+10)+x2-(3(-6x+10)-9x+1)=0
We add all the numbers together, and all the variables
x^2-9(3x+10)-(3(-6x+10)-9x+1)=0
We multiply parentheses
x^2-27x-(3(-6x+10)-9x+1)-90=0
We calculate terms in parentheses: -(3(-6x+10)-9x+1), so:We get rid of parentheses
3(-6x+10)-9x+1
We add all the numbers together, and all the variables
-9x+3(-6x+10)+1
We multiply parentheses
-9x-18x+30+1
We add all the numbers together, and all the variables
-27x+31
Back to the equation:
-(-27x+31)
x^2-27x+27x-31-90=0
We add all the numbers together, and all the variables
x^2-121=0
a = 1; b = 0; c = -121;
Δ = b2-4ac
Δ = 02-4·1·(-121)
Δ = 484
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{484}=22$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-22}{2*1}=\frac{-22}{2} =-11 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+22}{2*1}=\frac{22}{2} =11 $
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