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Re: A function, f(x) = 3x^2 - tx + 5 is tangent to x-axis. [#permalink]
1
Tangent to x axis means it has equal or only one real root,
this b^2 - 4ac = 0 , substitute value from parabola equation

t^2 - 4 * 3 * 5 = 0

t^2 -60=0

t = root 15 or -root 15

thus D
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