(2x+13)(x+11)-3(x+5)=0

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Solution for (2x+13)(x+11)-3(x+5)=0 equation: 



(2x+13)(x+11)-3(x+5)=0

We multiply parentheses

(2x+13)(x+11)-3x-15=0

We multiply parentheses ..

(+2x^2+22x+13x+143)-3x-15=0

We get rid of parentheses

2x^2+22x+13x-3x+143-15=0

We add all the numbers together, and all the variables

2x^2+32x+128=0

a = 2; b = 32; c = +128;
Δ = b2-4ac
Δ = 322-4·2·128
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$x=\frac{-b}{2a}=\frac{-32}{4}=-8$

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