Which one of the followings is an identi...

Which one of the followings is an identity ?

A

4x - 3 = 0

B

`x^(2)-(3a+1/a)x+3=0`

C

`x^(2)+y^(2)=(x+y)^(2)-2xy`

D

`ax^(2)+bx+c=0,ane0`

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Which one of the followings is true ?

A

N is bounded on one side

B

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D

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Which one of the following is not true?

A

`A - B subseteq A`

B

`B' - A' subseteq A`

C

`A subseteq A - B`

D

`A cap B' subseteq A`

which one of the following is false ?

A

if x and y be two negative real numbers, then xy will be also a negtive real number

B

If x be any real number, then ` x ge 0 or x lt 0`

C

If x and y be two non-negative real numbers, then xy will be positive

D

If x be a positive real number and y be a negative real number , then (x-y) will be positive

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CALCUTTA BOOK HOUSE-POLYNOMIALS-EXERCISE-1.3

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