4
Q:

 (3x + 2) (2x - 5) = ax² + kx + n .

What is the value of a - n + k ?

A) 5 B) 8
C) 9 D) 10

Answer:   A) 5



Explanation:

This is a quadratic equation. To find n we multiply the last terms in each bracket together (2 times -5) = -10

To find ‘a’ we multiply the first terms in each bracket together (3x times 2x) = 6x2, So a = 6.

Thus a - n = 16

To find k we multiply the first term in the first bracket by the second term in the second bracket and add the result to the product of the second term in the first bracket and the first term in the second. (-15x + 4x) = -11x. So k = -11

16 - 11 = 5

Subject: Problems on Numbers
Exam Prep: GRE
Q:

25 divided by15.

 

A) 1125 B) 5
C) 25 D) 125
 
Answer & Explanation Answer: D) 125

Explanation:
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0 6024
Q:

How much does one need to add to 4/5 to obtain 5/4?

A) 16/20 B) 1/-1
C) 1.25/0.8 D) 9/20
 
Answer & Explanation Answer: D) 9/20

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Exam Prep: Bank Exams

0 437
Q:

Find the number of zeroes in 129!

 

A) 31 B)  33    
C)  35   D) 37
 
Answer & Explanation Answer: A) 31

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0 8382
Q:

Which of the following numbers is a prime number?

A) 161 B) 181
C) 121 D) 141
 
Answer & Explanation Answer: B) 181

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0 429
Q:

Which of the following pairs is NOT a pair of twin primes?

A) 71, 73 B) 131, 133
C) 191, 193 D) 11, 13
 
Answer & Explanation Answer: B) 131, 133

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0 620
Q:

The smallest number that is completely divisibly by 6, 8, 12 and 16 is

A) 48 B) 24
C) 64 D) 80
 
Answer & Explanation Answer: A) 48

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Exam Prep: Bank Exams

1 451
Q:

Arrange the following in descending order.

 

54, 43 and 64

 

 

A) 1 B) 2
C) 3 D) 4
 
Answer & Explanation Answer: D) 4

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1 2561
Q:

Find the least number that must be subtracted from 98534, to get a number exactly divisible by 824.

A) 484 B) 478
C) 422 D) 375
 
Answer & Explanation Answer: B) 478

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2 540