Question

1. Let A ={x: x2 - 1 = 0 and x is rational} is​

Answer 1

Step-by-step explanation:

A= {x:x²-1= 0 and x is rational}

= x²-1=0

=x²= 1

=x= ±1

where, 1 and -1 are rational numbers.

Therefore, A= {-1, 1}