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If α = √3 + 1 and β = √3 − 1, what is αβ?

Answer and explanation

Correct answer: 2

The governing algebraic idea is the product of conjugate expressions: (a + b)(a − b) = a² − b². The given factors are conjugates, with a = √3 and b = 1. Hence αβ = (√3 + 1)(√3 − 1) = (√3)² − 1² = 3 − 1 = 2. If the product is expanded term by term, the middle terms +√3 and −√3 cancel, giving the same result. Therefore option A is correct. Option B can arise from an incorrect squaring or addition, option C ignores the complete multiplication, and option D does not follow from any valid simplification. The irrationality of √3 does not prevent exact calculation.

Related tags

Conjugate-SurdsIrrational-NumbersAlgebraic-OperationsReal-NumbersOperations On Real Numbers And The Laws Of ExponentsPolynomialsMathematicsClass 10 Mcq

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