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Grade: 12

                        

The equation x^2+bx+c=0 has distinct roots.if 2 is subtracted from each root, the results are reciprocals of the original roots. then the value of (b^2+c^2+ bc) ?

3 years ago

Answers : (1)

Arun
24737 Points
							
 

let the roots be a and b.

 

now subtracting 2 from each root ..

 

a-2 &b-2 r equal to reciprocal of original roots i.e a&b .

 

so,a-2=1/a &b-2=1/2

 

solving we get a=& b=1±√2

 

so we take a=1+√2 & b=1-√2

 

so

 

b^2+c^2+bc=(a+b)2 +ab2 +(a+b)*ab=4+1-2=3

 

hence the answer is 3

3 years ago
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