0.4(b/2)^2-1.2

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Solution for 0.4(b/2)^2-1.2 equation: 


b in (-oo:+oo)

0.4*(b/2)^2-1.2 = 0

0.1*b^2 = 1.2 // : 0.1

b^2 = 12

b^2 = 12 // ^ 1/2

abs(b) = 2*3^(1/2)

b = 2*3^(1/2) or b = -(2*3^(1/2))

b in { 2*3^(1/2), -(2*3^(1/2)) }

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