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(3y-2)(9+y)=0
We add all the numbers together, and all the variables
(3y-2)(y+9)=0
We multiply parentheses ..
(+3y^2+27y-2y-18)=0
We get rid of parentheses
3y^2+27y-2y-18=0
We add all the numbers together, and all the variables
3y^2+25y-18=0
a = 3; b = 25; c = -18;
Δ = b2-4ac
Δ = 252-4·3·(-18)
Δ = 841
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}$$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{841}=29$$y_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(25)-29}{2*3}=\frac{-54}{6} =-9 $$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(25)+29}{2*3}=\frac{4}{6} =2/3 $
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