9=-48u-64u^2

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Solution for 9=-48u-64u^2 equation: 



9=-48u-64u^2

We move all terms to the left:

9-(-48u-64u^2)=0

We get rid of parentheses

64u^2+48u+9=0

a = 64; b = 48; c = +9;
Δ = b2-4ac
Δ = 482-4·64·9
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$u=\frac{-b}{2a}=\frac{-48}{128}=-3/8$

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