1.6x^2-9=(0.4x-3)(0.4x+3)

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Solution for 1.6x^2-9=(0.4x-3)(0.4x+3) equation: 



1.6x^2-9=(0.4x-3)(0.4x+3)

We move all terms to the left:

1.6x^2-9-((0.4x-3)(0.4x+3))=0

We use the square of the difference formula

1.6x^2+0x^2+9-9=0

We add all the numbers together, and all the variables

2.6x^2=0

a = 2.6; b = 0; c = 0;
Δ = b2-4ac
Δ = 02-4·2.6·0
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$x=\frac{-b}{2a}=\frac{0}{5.2}=0$

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