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Question 13 : Let A be a real number. Then the roots of the equation x2 - 4x - log2A = 0 are real and distinct if and only if
For roots of any Quadratic equation to be real and distinct, D > 0
So, for x2 − 4x - = 0,
D = (-4)2 - (4 x 1 x (-)) > 0
16 + 4 > 0
4 + > 0
The question is "Let A be a real number. Then the roots of the equation x2 - 4x - log2A = 0 are real and distinct if and only if"
Choice C is the correct answer.
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