Question

The set $A = \left\{ x : x \in R , x ^ { 2 } = 16 \right.$ and $2 x = 6 \}$ equals

• A. $\phi$
• B. [14, 3, 4]
• C. [3]
• D. [4]

Answer 1

Answer: (A)

$\phi$

Answer 2

$x = \pm 4$

$x = 3$

There is no value of x which satisfies both the above equations. Thus, $A = \phi$.