If α , β are the roots of 11 x 2 + 12 x - 13 = 0 , then 1 α 2 + 1 β 2 = ? (approximately…

If α,β are the roots of 11x2+12x-13=0, then 1α2+1β2=? (approximately close to)
  1. 4.54
  2. 3.54
  3. 2.54
  4. 1.54

Solution

Given, 11x2+12x-13=0

Then, α+β=-1211 and αβ=-1311

Now, 1α2+1β2=α2+β2α2β2

=α+β2-2αβαβ2

Putting the values we get, 

=-12112-2-1311-13112

=1.19+2.361.39

2.54

Asked in: AP EAMCET 2021 (19 Aug Shift 2)

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