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(2x+1)(x-3)+(x+6)(2x+1)=0
We multiply parentheses ..
(+2x^2-6x+x-3)+(x+6)(2x+1)=0
We get rid of parentheses
2x^2-6x+x+(x+6)(2x+1)-3=0
We multiply parentheses ..
2x^2+(+2x^2+x+12x+6)-6x+x-3=0
We add all the numbers together, and all the variables
2x^2+(+2x^2+x+12x+6)-5x-3=0
We get rid of parentheses
2x^2+2x^2+x+12x-5x+6-3=0
We add all the numbers together, and all the variables
4x^2+8x+3=0
a = 4; b = 8; c = +3;
Δ = b2-4ac
Δ = 82-4·4·3
Δ = 16
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{16}=4$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(8)-4}{2*4}=\frac{-12}{8} =-1+1/2 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(8)+4}{2*4}=\frac{-4}{8} =-1/2 $
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