(3x+15)(5x+25)=0

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Solution for (3x+15)(5x+25)=0 equation: 



(3x+15)(5x+25)=0

We multiply parentheses ..

(+15x^2+75x+75x+375)=0

We get rid of parentheses

15x^2+75x+75x+375=0

We add all the numbers together, and all the variables

15x^2+150x+375=0

a = 15; b = 150; c = +375;
Δ = b2-4ac
Δ = 1502-4·15·375
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$x=\frac{-b}{2a}=\frac{-150}{30}=-5$

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