68
Q:

Find the quadratic equations whose roots are the reciprocals of the roots of 2x2+5x+3?

A)  3x2+5x+2=0   

B) 5x2+3x+2=0 

C) 3x2-5x-2=0   

D)  None



A) A B) B
C) C D) D

Answer:   A) A



Explanation:

The quadratic equation whose roots are reciprocal of 2x2+5x+3=0 can be obtained by replacing x by 1/x.

 

Hence, 2(1/x)(1/x)+ 5(1/x) + 3 = 0

 

=> 3x2+5x+2=0

 

 

Subject: Mathematical Operations
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Q:

If "–" stands for "÷", "+"stands for "x", "÷" for "–" and "x" for "+", which of the following equations is correct?

A) 40 – 10 + 5 ÷ 4 x 5 = 21 B) 40 + 10 – 4 x 5 ÷ 3 = 80
C) 40 ÷ 10 – 4 x 5 + 3 = 32 D) 8 – 4 x 40 ÷ 2 + 15 = 30
 
Answer & Explanation Answer: A) 40 – 10 + 5 ÷ 4 x 5 = 21

Explanation:
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23 3042
Q:

If "#" means "subtraction", "&" means "division", "@" means "addition" and "%" means "multiplication" then

 

516 & 6 # 11 @ 50 % 4 = ?

 

A) 210 B) 274
C) 250 D) 275
 
Answer & Explanation Answer: D) 275

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15 5066
Q:

Select the missing number from the given responses.

A) 45 B) 65
C) 70 D) 80
 
Answer & Explanation Answer: B) 65

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38 2693
Q:

If '+' means subtraction, '÷' means addition, '<' means multiplication and '>' means division, then find the value of the given statement,

The value of 9 ÷ 7 < 8 > (4>2) + 5 will be

A) 32 B) 18
C) 16 D) 11
 
Answer & Explanation Answer: A) 32

Explanation:
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15 2136
Q:

Find the missing number from the alternatives.

A) 125 B) 175
C) 225 D) 250
 
Answer & Explanation Answer: C) 225

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15 1647
Q:

Find the missing number?

A) 32 B) 30
C) 28 D) 36
 
Answer & Explanation Answer: D) 36

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6 1410
Q:

Find the missing number?

A) 120 B) 23
C) 55 D) 30
 
Answer & Explanation Answer: B) 23

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8 1681
Q:

Select the missing number in the given question?

A) 9 B) 4
C) 8 D) 2
 
Answer & Explanation Answer: D) 2

Explanation:
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15 1801