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Q.

The quadratic equation whose one root is 3+525 is 

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a

x2+22x4=0

b

x2+11x+8=0

c

x2+22x+4=0

d

x2+11x8=0

answer is B.

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Detailed Solution

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The given root is α=3+52-5

Rationalize the denominator

α=3+52-5·2+52+5 =6+35+25+54-5 =11+55-1 =-11-55

SInce the irrational roots are conjugate to each other, the other root is β=-11+55

Use the formula to get the equation having roots α,β as x2-xα+β-αβ=0

Therefore, the equation whose roots are -11-55,-11+55 is x2-x-22+121-125=0

Simplifying the above equation will get the required equation as x2+22x-4=0

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The quadratic equation whose one root is 3+52−5 is