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(2x+1)(7x-1)=0
We multiply parentheses ..
(+14x^2-2x+7x-1)=0
We get rid of parentheses
14x^2-2x+7x-1=0
We add all the numbers together, and all the variables
14x^2+5x-1=0
a = 14; b = 5; c = -1;
Δ = b2-4ac
Δ = 52-4·14·(-1)
Δ = 81
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{81}=9$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(5)-9}{2*14}=\frac{-14}{28} =-1/2 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(5)+9}{2*14}=\frac{4}{28} =1/7 $
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