(5x+2)*(15x+6)=0

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Solution for (5x+2)*(15x+6)=0 equation: 



(5x+2)(15x+6)=0

We multiply parentheses ..

(+75x^2+30x+30x+12)=0

We get rid of parentheses

75x^2+30x+30x+12=0

We add all the numbers together, and all the variables

75x^2+60x+12=0

a = 75; b = 60; c = +12;
Δ = b2-4ac
Δ = 602-4·75·12
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$x=\frac{-b}{2a}=\frac{-60}{150}=-2/5$

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