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The given equation is,
9(x2 + 1x2) − 9(x + 1x) − 52 = 0 .........
(1)put x + 1x
= y⇒(x + 1x)2
= y⇒x2 + 1x2 + 2 × x × 1x
= y2⇒x2 + 1x2
= y2 − 2
Now, from (1), we get
9(y2−2) − y − 52 = 0
⇒9y2 − 9y − 70 = 0
⇒9y2 − 30y + 21y − 70 = 0
⇒3y(3y − 10) + 7(3y − 10) = 0
⇒(3y + 7)(3y − 10) = 0
⇒3y + 7 = 0 or 3y − 10 = 0
⇒y = −73 or y = 103
When y = −73,
thenx + 1x = −73
⇒x2+1x = −73
⇒3x2 + 7x + 3 = 0
We have, a = 3; b = 7; c = 3
Now, D = b2 − 4ac = 49 − 36 = 13>0
So,
x = −b±√D2a = −7±√136When y = 103
, then
x2+1x = 103⇒3x2 − 10x + 3 = 0⇒3x2 − 9x − x + 3 = 0
⇒3x(x − 3) − 1(x − 3) = 0
⇒(3x − 1)(x − 3) = 0
⇒3x−1 = 0 or x − 3 =0
⇒x = 13 or x = 3
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