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6x+5=x(2)-7
We move all terms to the left:
6x+5-(x(2)-7)=0
We add all the numbers together, and all the variables
-(+x^2-7)+6x+5=0
We get rid of parentheses
-x^2+6x+7+5=0
We add all the numbers together, and all the variables
-1x^2+6x+12=0
a = -1; b = 6; c = +12;
Δ = b2-4ac
Δ = 62-4·(-1)·12
Δ = 84
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{84}=\sqrt{4*21}=\sqrt{4}*\sqrt{21}=2\sqrt{21}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(6)-2\sqrt{21}}{2*-1}=\frac{-6-2\sqrt{21}}{-2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(6)+2\sqrt{21}}{2*-1}=\frac{-6+2\sqrt{21}}{-2} $
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