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If \(f(x) = 3x^2 - tx + 5\) is tangents to \(x\)-axis, what is the value of a positive number \(t?\)
A. \(2\sqrt{15}\)
B. \(4\sqrt{15}\)
C. \(3\sqrt{13}\)
D. \(4\sqrt{13}\)
E. \(6\sqrt{15}\)
Answer: A
Source: GMAT Paper Tests
A. \(2\sqrt{15}\)
B. \(4\sqrt{15}\)
C. \(3\sqrt{13}\)
D. \(4\sqrt{13}\)
E. \(6\sqrt{15}\)
Answer: A
Source: GMAT Paper Tests
