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(2x-7)(-3x+12)=0
We multiply parentheses ..
(-6x^2+24x+21x-84)=0
We get rid of parentheses
-6x^2+24x+21x-84=0
We add all the numbers together, and all the variables
-6x^2+45x-84=0
a = -6; b = 45; c = -84;
Δ = b2-4ac
Δ = 452-4·(-6)·(-84)
Δ = 9
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{9}=3$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(45)-3}{2*-6}=\frac{-48}{-12} =+4 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(45)+3}{2*-6}=\frac{-42}{-12} =3+1/2 $
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