Discussion
Home ‣ Aptitude ‣ Quadratic Equation Comments
- Question
- ?. 17x 2 + 48x = 9
?. 13y 2 = 32y ? 12
Options- A. 1
- B. 2
- C. 3
- D. 4
- Correct Answer
- 1
Explanation
- 1. ?. 4x + 7y = 209
?. 12x ? 14y = ?38
Options- A. 1
- B. 2
- C. 3
- D. 4 Discuss
- 2. ?. 18x 2 + 18x + 4 = 0
?. 12y 2 + 29y + 14 =0
Options- A. 1
- B. 2
- C. 3
- D. 4 Discuss
- 3. ?. 16x 2 + 20x + 6 = 0
?. 10y 2 + 38y + 24 = 0
Options- A. 1
- B. 2
- C. 3
- D. 4 Discuss
- 4. Construct a quadratic equation whose roots are ?2 and 2 ?2
Options- A. x 2 - 3?2x - 4 = 0
- B. x 2 - 3?2x + 4 = 0
- C. x 2 + 3?2x - 4 = 0
- D. x 2 + 3?2x + 4 = 0 Discuss
- 5. If ? and ? are the roots of the quadratic equation ax2 + bx + c = 0, then the value of
? + ? is ? ?
Options- A. b 2 - 2ac ac
- B. b 2 - 2ac 2ac
- C. b 2 - ac 2ac
- D. b 2 + 2ac ac Discuss
- 6. ?. 8x 2 + 6x = 5
?. 12y 2 ? 22y + 8 = 0
Options- A. 1
- B. 2
- C. 3
- D. 4 Discuss
- 7. Two successive discounts of 20% and 20% are equivalent to a single discount of
Options- A. 42%
- B. 40%
- C. 36%
- D. 34% Discuss
- 8. On a 20 % discount sale, an article costs 596 . What was the original price of the article?
Options- A. ? 720
- B. ? 735
- C. ? 745
- D. ? 775 Discuss
- 9. If an electricity bill is paid before due date, one gets a reduction of 4 % on the amount of the bill . By paying the bill before due date, a person got a reduction of ? 13 . The amount of his electricity bill was
Options- A. ? 125
- B. ? 225
- C. ? 325
- D. ? 425 Discuss
- 10. Successive discounts of 10%, 20% and 30% is equivalent to single discount of?
Options- A. 60%
- B. 49.6%
- C. 40.5%
- D. 36% Discuss
Quadratic Equation problems
Search Results
Correct Answer:
Explanation:
Correct Answer: 4
Explanation:
Correct Answer: 2
Explanation:
Correct Answer: x 2 - 3?2x + 4 = 0
Explanation:
Let k1 and k2 be the roots of quadratic equation .
Given :- k1 = ?2 and k2 = 2 ?2
Sum of the roots = ?2 + 2 ?2 = 3 ?2
Product of the roots = ( ?2 ) ( 2?2 ) = 4
Hence the required quadratic equation is x 2 = (sum of the roots) x + (Product of two roots) = 0
? x 2 - 3 ?2x + 4 = 0.
Correct Answer: b 2 - 2ac ac
Explanation:
Correct Answer: 3
Explanation:
Correct Answer: 36%
Explanation:
Given, r1 = 20% and r2 = 20%
? Single discount equal to r1 and r2
= (r1 + r2 - r1 x r2) / 100 %
= (20 + 20 - 20 x 20) / 100
= 40 - 4 = 36%
Correct Answer: ? 745
Explanation:
Let the original price of be N .
? At discount of 20% article costs ? 596
? 596 = (80 x N)/100
? N = (596 x 100)/80
? N = 745
? original price = ? 745
Correct Answer: ? 325
Explanation:
Let amount of electricity bill = ? N
? 4% of N = 13
? (4 x N)/100 = 13
? N = 13 x 25 = ? 325
Correct Answer: 49.6%
Explanation:
Here, r1 = 10 %, r2 = 20% and r3 = 30%
? Required discount
= [1 - (1 - r1/100) (1 - r2/100) (1 - r3/100)] x 100%
= [1 - (1 -10/100) (1 - 20/100) (1 - 30/100)] x 100%
= {1 - (9/10) x (4/5) x (7/10)} x 100%
= (1 - 0.504) x 100% = 49.6%
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