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How will the roots of (x^2-2\sqrt{7}x+3=0) be?

Answer and explanation

Correct answer: Real, irrational and distinct

The direct answer is A: the roots are real, irrational, and distinct. Here a=1, b=-2√7, and c=3. The discriminant is D=b^2-4ac=(-2√7)^2-4(1)(3)=28-12=16, which is positive, so the roots are real and different. Using the quadratic formula, x=(2√7 plus or minus 4)/2=√7 plus or minus 2. Since √7 is irrational, adding or subtracting the rational number 2 still gives irrational numbers. Option A is correct. Option B is wrong because D is not zero. Option C is wrong because D is positive. Option D is wrong because the roots are not rational. The key test is: positive non-square-related root expressions may be irrational; here the explicit roots show this clearly.

Related tags

Quadratic EquationsSurd RootsIrrational Distinct

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