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8y+3+3=y(y+6)
We move all terms to the left:
8y+3+3-(y(y+6))=0
We add all the numbers together, and all the variables
8y-(y(y+6))+6=0
We calculate terms in parentheses: -(y(y+6)), so:We get rid of parentheses
y(y+6)
We multiply parentheses
y^2+6y
Back to the equation:
-(y^2+6y)
-y^2+8y-6y+6=0
We add all the numbers together, and all the variables
-1y^2+2y+6=0
a = -1; b = 2; c = +6;
Δ = b2-4ac
Δ = 22-4·(-1)·6
Δ = 28
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$y_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{28}=\sqrt{4*7}=\sqrt{4}*\sqrt{7}=2\sqrt{7}$$y_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(2)-2\sqrt{7}}{2*-1}=\frac{-2-2\sqrt{7}}{-2} $$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(2)+2\sqrt{7}}{2*-1}=\frac{-2+2\sqrt{7}}{-2} $
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