49x^2+9=-42x

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Solution for 49x^2+9=-42x equation: 



49x^2+9=-42x

We move all terms to the left:

49x^2+9-(-42x)=0

We get rid of parentheses

49x^2+42x+9=0

a = 49; b = 42; c = +9;
Δ = b2-4ac
Δ = 422-4·49·9
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$x=\frac{-b}{2a}=\frac{-42}{98}=-3/7$

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