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A quadratic equation, whose roots are 2 + √3 and 2 – √3 = ………………. 

A) x2 – x – 4 = 0 

B) x2 – 4x + 1 = 0 

C) x2 + 4x + 3 = 0 

D) x2 + x – 3 = 0

2 Answers

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Best answer

Correct option is (B) x2 – 4x + 1 = 0

Roots of quadratic equation are \(2+\sqrt{3}\) and \(2-\sqrt{3}.\) 

\(\therefore\) Required quadratic equation is

\((x-(2+\sqrt{3}))(x-(2-\sqrt{3}))=0\)

\(\Rightarrow((x-2)-\sqrt3)((x-2)+\sqrt3)=0\)

\(\Rightarrow(x-2)^2-(\sqrt3)^2=0\)     \((\because(a-b)(a+b)=a^2-b^2)\)

\(\Rightarrow x^2-4x+4-3=0\)       \((\because(a-b)^2=a^2-2ab+b^2)\)

\(\Rightarrow x^2-4x+1=0\)

+1 vote
by (41.1k points)

Correct option is B) x2 – 4x + 1 = 0

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