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6x+2x(3x+6)=4x+9(x+6)
We move all terms to the left:
6x+2x(3x+6)-(4x+9(x+6))=0
We multiply parentheses
6x^2+6x+12x-(4x+9(x+6))=0
We calculate terms in parentheses: -(4x+9(x+6)), so:We add all the numbers together, and all the variables
4x+9(x+6)
We multiply parentheses
4x+9x+54
We add all the numbers together, and all the variables
13x+54
Back to the equation:
-(13x+54)
6x^2+18x-(13x+54)=0
We get rid of parentheses
6x^2+18x-13x-54=0
We add all the numbers together, and all the variables
6x^2+5x-54=0
a = 6; b = 5; c = -54;
Δ = b2-4ac
Δ = 52-4·6·(-54)
Δ = 1321
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{-(5)-\sqrt{1321}}{2*6}=\frac{-5-\sqrt{1321}}{12} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(5)+\sqrt{1321}}{2*6}=\frac{-5+\sqrt{1321}}{12} $
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