7a(-7a)=0

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Solution for 7a(-7a)=0 equation: 



7a(-7a)=0

We multiply parentheses

-49a^2=0

a = -49; b = 0; c = 0;
Δ = b2-4ac
Δ = 02-4·(-49)·0
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$a=\frac{-b}{2a}=\frac{0}{-98}=0$

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