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(3x+6)(8x+5)=0
We multiply parentheses ..
(+24x^2+15x+48x+30)=0
We get rid of parentheses
24x^2+15x+48x+30=0
We add all the numbers together, and all the variables
24x^2+63x+30=0
a = 24; b = 63; c = +30;
Δ = b2-4ac
Δ = 632-4·24·30
Δ = 1089
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{1089}=33$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(63)-33}{2*24}=\frac{-96}{48} =-2 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(63)+33}{2*24}=\frac{-30}{48} =-5/8 $
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