75-0.3(a/10)^2

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Solution for 75-0.3(a/10)^2 equation: 


a in (-oo:+oo)

75-(0.3*(a/10)^2) = 0

75-0.3*(a/10)^2 = 0

-0.003*a^2 = -75 // : -0.003

a^2 = 25000

a^2 = 25000 // ^ 1/2

abs(a) = 50*10^(1/2)

a = 50*10^(1/2) or a = -(50*10^(1/2))

a in { 50*10^(1/2), -(50*10^(1/2)) }

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