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If √2 and √8 are zeroes of a quadratic polynomial, what is the sum of the zeroes?

Answer and explanation

Correct answer: 3√2

The required quantity is the sum of the two given zeroes, so the radicals must first be simplified and then combined. Simplify √8 as √(4 × 2) = √4 × √2 = 2√2. Hence the sum is √2 + √8 = √2 + 2√2 = 3√2, making option A correct. Option C would result from incorrectly treating √8 as 3√2. Option B combines the radicands as if addition of radicals were multiplication, which is not a valid rule. Option D is also not the sum of the given zeroes. The key principle is that like surds can be added only after they have been expressed with the same square-free radicand; their coefficients are then added.

Related tags

SurdsSimplificationSum Of ZeroesIrrational NumbersPolynomialsPolynomials In One VariableMathematicsClass 10 Mcq

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