Latest Elitmus Aptitude Question SOLUTION: find the number of value of x where (2x+9)^2/(x+3) value is integer option a)2 b)4 c)6 4)infinity

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(#M40152970) ELITMUS Numerical Ability question Keep an EYE

find the number of value of x where (2x+9)^2/(x+3) value is integer
option a)2 b)4 c)6 4)infinity

Asked In Elitmus RAHUL PRASAD (8 years ago)

Unsolved Read Solution (10)

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RAKESH  (8 years ago)

(2x+9)^2 / (x+3) = {2(x+3)+3}^2 / (x+3) = 4(x+3) + 12 + 9/(x+3)

for 9/(x+3) to be integer

x = -12,-6,-4,-2,0,6
6 values

Is this solution Helpfull? Yes (45) | No (1)  

ADITYA KUMAR MAURYA  (8 years ago)

put the option and get ans 6

Is this solution Helpfull? Yes (4) | No (8)  

subhash kumar  (8 years ago)

put the value of x=0,-2,-4,.. nd we got ans is 4

Is this solution Helpfull? Yes (3) | No (4)  

sukriti singh  (8 years ago)

ans is option (b).

Is this solution Helpfull? Yes (3) | No (1)  

Vikas Jha  (8 years ago)

Sorry.. -2,-6 will also give int value so the ans will be option b) 4.. not option a..

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neelkanth thakur  (8 years ago)

(2X+9)2/(X+3)=(2X+9)*[(2X+9)/(X+3)]=1*2
Part 1 will be integer for every integral value of X,
Part II (2X+6+3)/(X+3)=[(2X+6)/(X+3)]+[3/(X+3)]=2+[3/(X+3)]
so 3/(X+3) would be an integer for X value 0 and -6.
So 2 values

Is this solution Helpfull? Yes (2) | No (3)  

santosh  (8 years ago)

chotu scored 80% marks on an average in 5 subjects his individual marks lies between 50 to 100.. out of 100.all terms have 5 subjects. and all subjects have wqual weightage .he does not get tge same marks in any 2 subjects across terms if he scored 60 marks in 1 subject .he will not get 60 marks fie the same sybject .how many max no of term cab his average marks remains exactly 80%

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Vikas Jha  (8 years ago)

(2x+9)^2 can be written as ((4x+24)+9/(x+3))
Now the first part will always give an int value, and the second part(9/(x+3)) will give int value for 0,+6 only... So the option is a)2..

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ujjwal  (8 years ago)

c) 6 put the value in the equation and check it will come as 441/9

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ROHIT YADAV  (8 years ago)

x=0,-2,-4,-6, after no value will satisfy ok so b

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