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x2+12x=4x-9
We move all terms to the left:
x2+12x-(4x-9)=0
We add all the numbers together, and all the variables
x^2+12x-(4x-9)=0
We get rid of parentheses
x^2+12x-4x+9=0
We add all the numbers together, and all the variables
x^2+8x+9=0
a = 1; b = 8; c = +9;
Δ = b2-4ac
Δ = 82-4·1·9
Δ = 28
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{28}=\sqrt{4*7}=\sqrt{4}*\sqrt{7}=2\sqrt{7}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(8)-2\sqrt{7}}{2*1}=\frac{-8-2\sqrt{7}}{2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(8)+2\sqrt{7}}{2*1}=\frac{-8+2\sqrt{7}}{2} $
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