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

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



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

We multiply parentheses ..

(+21x^2+21x+21x+21)=0

We get rid of parentheses

21x^2+21x+21x+21=0

We add all the numbers together, and all the variables

21x^2+42x+21=0

a = 21; b = 42; c = +21;
Δ = b2-4ac
Δ = 422-4·21·21
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$x=\frac{-b}{2a}=\frac{-42}{42}=-1$

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