Discussion
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- Question
For what value of k, the expression x6? 18x3 + k will be a perfect square?
Options- A. -9
- B. 81
- C. 9
- D. -81
- Correct Answer
- 81
- 1. In the given questions, two equations numbered I and II are given. Solve both the equation and mark the appropriate answer. I. x2?5x ?24 = 0II. 2y2+ 19y + 35 = 0
Options- A. x > y
- B. x>y
- C. x < y
- D. x
Correct Answer:
Explanation:
x^2?5x ?24 = 0
(x-8) (x+3)
x = 8, -3
II. 2y^2+ 19y + 35 = 0
(2y+7) (y+7)y= -7, -5/2
So can?t be determined
- 2. What approximate value should come in place of the question mark (?) in the following equation (Note: You are not expected to calculate the exact value)? [(7.99)2?(13.001)2+(4.01)3]2=?
Options- A. -1800
- B. 1450
- C. -1660
- D. 1660 Discuss
- 3. What approximate value should come in place of the question mark (?) in the following questions? (You are not expected to calculate the exact value.) 21.003 × 39.998 ?209.91 = 126× ?
Options- A. 5
- B. 4
- C. 3
- D. 2 Discuss
- 4. What is the simplified value of 1-sin A1+sin A ?
Options- A. tan A
- B. sec A
- C. sec A + tan A
- D. sec A ? tan A Discuss
- 5. What is the simplified value of (1? sin A cos A)(sin A + cos A)?
Options- A. sin2A ? cos2A
- B. sin3A + cos3A
- C. 0
- D. 1 Discuss
- 6. If 5+x+5-x5+x-5-x = 3 ,then what is the value of x ?
Options- A. 5/2
- B. 25/3
- C. 4
- D. 3 Discuss
- 7. If x = 4aba+b , then what is the value of x+2ax-2a+x+2bx-2b ?
Options- A. 0
- B. 2
- C. 4
- D. 1 Discuss
- 8. In a triangle PQR, ?Q = 90°. If PQ = 12 cm and QR = 5 cm, then what is the radius (in cm) of the circum circle of the triangle?
Options- A. 5
- B. 6
- C. 6.5
- D. 6?2 Discuss
- 9. P is a point outside the circle at distance of 6.5 cm from centre O of the circle. PR be a secant such that it intersects the circle at Q and R. If PQ = 4.5 cm and QR = 3.5 cm, then what is the radius (in cm) of the circle?
Options- A. 1.5
- B. 2
- C. 2.5
- D. 3 Discuss
- 10. If tan ? + cot ? = x, then what is the value of tan4? + cot4? ?
Options- A. (x3 ? 3)2 + 2
- B. (x4 ? 2x) + 4
- C. x2 (x2 ? 4) + 2
- D. x Discuss
Simplification problems
Search Results
Correct Answer: 1660
Explanation:
[(7.99)^2?(13.001)^2+(4.01)^3]^2= X X= [8^2-13^2+4^3]^2 X= [64-169+64]^2 X= [-41]^2 X=1681
Correct Answer: 5
Explanation:
Take nearest values21.003 × 39.998 ?209.91 = 126× ?630 = 126× ?? = 5 (approx)
Correct Answer: sec A ? tan A
Correct Answer: sin3A + cos3A
Correct Answer: 3
Correct Answer: 2
Correct Answer: 6.5
Correct Answer: 2.5
Correct Answer: x2 (x2 ? 4) + 2
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