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

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



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

We add all the numbers together, and all the variables

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

We multiply parentheses ..

3(-49x^2+14x+14x-4)=0

We multiply parentheses

-147x^2+42x+42x-12=0

We add all the numbers together, and all the variables

-147x^2+84x-12=0

a = -147; b = 84; c = -12;
Δ = b2-4ac
Δ = 842-4·(-147)·(-12)
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$x=\frac{-b}{2a}=\frac{-84}{-294}=2/7$

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