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(6x+5)(4x-1)=0
We multiply parentheses ..
(+24x^2-6x+20x-5)=0
We get rid of parentheses
24x^2-6x+20x-5=0
We add all the numbers together, and all the variables
24x^2+14x-5=0
a = 24; b = 14; c = -5;
Δ = b2-4ac
Δ = 142-4·24·(-5)
Δ = 676
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{676}=26$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(14)-26}{2*24}=\frac{-40}{48} =-5/6 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(14)+26}{2*24}=\frac{12}{48} =1/4 $
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