Question

Write the set builder form A = {-1, 1}.

• A. A = {x : x is a real number}
• B. A = {x : x is an integer}
• C. A = {x : x is a root of equation $x^2=1$}
• D. A = {x :x is a root of the equation $x^2+1=0$ }

Answer 1

The correct option is C

A = {x : x is a root of equation $x^2=1$}

Basic: Clearly ‘x’ is root of $x^2=1$.