# CBSE Class 11th Math 5 – Complex Numbers and Quadratic Equations MCQs

#### If the roots of x^{2} - ax + b = 0 differ by unity, then we get ____.

Correct!
Wrong!

From the equation, we get, Let the 2 roots be α and (α + 1) α + β = a ⇒ α + (α + 1) = a ⇒ α = (a-1)/2 Similarly, α β = b ⇒ α(α+1)=b ⇒ [(a-1)/2] [(a-1)/2]+1 = b ⇒ (a – 1)(a+1) = 4b ⇒ a^{2} -1=4b

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CBSE Class 11th Math 5 - Complex Numbers and Quadratic Equations MCQs

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