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(14a+1)(a+1)=0
We multiply parentheses ..
(+14a^2+14a+a+1)=0
We get rid of parentheses
14a^2+14a+a+1=0
We add all the numbers together, and all the variables
14a^2+15a+1=0
a = 14; b = 15; c = +1;
Δ = b2-4ac
Δ = 152-4·14·1
Δ = 169
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$a_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$a_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{169}=13$$a_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(15)-13}{2*14}=\frac{-28}{28} =-1 $$a_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(15)+13}{2*14}=\frac{-2}{28} =-1/14 $
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