Manipal MET2021MathematicsBasics of Mathematics
If x= 2 2 - 7 2 2 + 7 , then x+x⁻¹ is equal to
Options
- A28
- B32
- C30
- D24
Correct answer
C. 30
Step-by-step solution
Given, x= 2 2 - 7 2 2 + 7 aligned x+ 1 x & = 2 2 - 7 2 2 + 7 + 2 2 + 7 2 2 - 7 & = 8+7-4 14 +8+7+4 14 8-7 =30 aligned