7(x-3)(2x-6)=0

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Solution for 7(x-3)(2x-6)=0 equation: 



7(x-3)(2x-6)=0

We multiply parentheses ..

7(+2x^2-6x-6x+18)=0

We multiply parentheses

14x^2-42x-42x+126=0

We add all the numbers together, and all the variables

14x^2-84x+126=0

a = 14; b = -84; c = +126;
Δ = b2-4ac
Δ = -842-4·14·126
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$x=\frac{-b}{2a}=\frac{84}{28}=3$

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