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(2a-9)(3a+12)=0
We multiply parentheses ..
(+6a^2+24a-27a-108)=0
We get rid of parentheses
6a^2+24a-27a-108=0
We add all the numbers together, and all the variables
6a^2-3a-108=0
a = 6; b = -3; c = -108;
Δ = b2-4ac
Δ = -32-4·6·(-108)
Δ = 2601
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$a_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$a_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{2601}=51$$a_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-3)-51}{2*6}=\frac{-48}{12} =-4 $$a_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-3)+51}{2*6}=\frac{54}{12} =4+1/2 $
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