Correct Answer - Option 3 : 10
Given:
2x2 - 6x = 1
Concept used:
(a – b)2 = a2 + b2 – 2ab
Calculation:
2x2 - 6x = 1
⇒ x – 3 = 1/2x [dividing both sides by 2x]
⇒ x – 1/2x = 3
⇒ (x – 1/2x)2 = 9 [squaring both sides]
⇒ x2 + 1/4x2 – 1 = 9
⇒ x2 + 1/4x2 = 10
∴ Required value of x2 + 1/4x2 is 10