Question

Find the product with its conjugate pair of $\sqrt{48}+\sqrt{18}$

• A. $28$
• B. $-28$
• C. $30$
• D. $-30$

Answer 1

Answer: (C)

$30$

The conjugate of $\sqrt{48}-\sqrt{18}$ is $\sqrt{48}+\sqrt{18}$
$(\sqrt{48}-\sqrt{18})(\sqrt{48}+\sqrt{18})=48-18=30$