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3(2x+1)+(x+5)(2x+1)=0
We multiply parentheses
6x+(x+5)(2x+1)+3=0
We multiply parentheses ..
(+2x^2+x+10x+5)+6x+3=0
We get rid of parentheses
2x^2+x+10x+6x+5+3=0
We add all the numbers together, and all the variables
2x^2+17x+8=0
a = 2; b = 17; c = +8;
Δ = b2-4ac
Δ = 172-4·2·8
Δ = 225
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{225}=15$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(17)-15}{2*2}=\frac{-32}{4} =-8 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(17)+15}{2*2}=\frac{-2}{4} =-1/2 $
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