4=b2/5

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Solution for 4=b2/5 equation: 


b in (-oo:+oo)

4 = (b^2)/5 // - (b^2)/5

4-((b^2)/5) = 0

-1/5*b^2 = -4 // : -1/5

b^2 = 20

b^2 = 20 // ^ 1/2

abs(b) = 2*5^(1/2)

b = 2*5^(1/2) or b = -(2*5^(1/2))

b in { 2*5^(1/2), -(2*5^(1/2)) }

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