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(7x+3)(1-4x)=0
We add all the numbers together, and all the variables
(7x+3)(-4x+1)=0
We multiply parentheses ..
(-28x^2+7x-12x+3)=0
We get rid of parentheses
-28x^2+7x-12x+3=0
We add all the numbers together, and all the variables
-28x^2-5x+3=0
a = -28; b = -5; c = +3;
Δ = b2-4ac
Δ = -52-4·(-28)·3
Δ = 361
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{361}=19$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-5)-19}{2*-28}=\frac{-14}{-56} =1/4 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-5)+19}{2*-28}=\frac{24}{-56} =-3/7 $
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