Question

which two numbers are resiprocal salf

Answer 1

reciprocal of x =1/x
reciprocal of -1=1/-1
=-1
reciprocal of 1 =1/1
1

therefore 1 and -1 are the two no. which are reciprocal of itself

Answer 2

Answer:

1  and -1 are reciprocal to itself.

Step-by-step explanation:

Since a real number x has the reciprocal $\frac{1}{x}$,

Because,

$x\times \frac{1}{x}=1$

Where, 1 ∈ R is the multiplicative identity,

Let y be the number which is reciprocal to itself,

i.e.

$y\times y = 1$

$\implies y^2 = 1$

$\implies y = \pm 1$

Hence, 1 and -1 are reciprocal to itself.

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