ALGEBRA MCQ SET 2
1. If x + 1/x = -14 , and x< -1 , what will be the value of xยฒ – 1/xยฒ ?
(a) -112โ3
(b) 112โ3
(c) -140โ2
(d) 140โ2
Answer: B
2. If xยฒ – 7x + 1 = 0 , and 0 < x< 1 , what is the value of xยฒ – 1/xยฒ ?
(a) 21โ5
(b) -21โ5
(c) 28โ5
(d) -28โ5
Answer: B
3. If [xยฒ + 1/xยฒ] = 7 , and 0 < x < 1 , find the value of xยฒ – 1/xยฒ =ย
(a) 3โ5
(b) 4โ3
(c) -4โ3
(d) -3โ5
Answer: D
4. If x + 1/9x = 3 , then the value of 9xยฒ + 1/9xยฒ is :
(a) 87
(b) 81
(c) 77
(d) 79
Answer: D
5. If x + 1/16x = 3 , then the value of 16xยณ + 1/256xยณ is :
(a) 423
(b) 441
(c) 432
(d) 414
Answer: A
6. If x^8 – 433x^4 + 16 = 0 , x > 0 , then what is the value of (x + 2/x) .
(a) 5
(b) 7
(c) 4
(d) 9
Answer: A
7. If x + 1/x = 2 , then find the value of (x^2723 + 1/x^3356) .
(a) 1
(b) 2
(c) 0
(d) -1
ย Answer: B
8. If x = 7 – 4โ3 , then find the value of (xยฒ + 1/xยฒ) .
(a) 195
(b) 197
(c) 196
(d) 194
Answer: D
9. If x = 8 + โ5 and y = 8 – โ5 , then find the value of xยฒ + yยฒ is :
(a) 138
(b) 143
(c) 140
(d) 124
Answer: A
10. If (x + y)ยณ – (x – y)ยณ – 3y(2xยฒ – 3yยฒ) = kyยณ , then find the value of k.
(a) 10
(b) 8
(c) 10.5
(d) 11
Answer: D
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