(-9a-8)(-9a-8)=0

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Solution for (-9a-8)(-9a-8)=0 equation: 



(-9a-8)(-9a-8)=0

We multiply parentheses ..

(+81a^2+72a+72a+64)=0

We get rid of parentheses

81a^2+72a+72a+64=0

We add all the numbers together, and all the variables

81a^2+144a+64=0

a = 81; b = 144; c = +64;
Δ = b2-4ac
Δ = 1442-4·81·64
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$a=\frac{-b}{2a}=\frac{-144}{162}=-8/9$

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