Question

$3 \sqrt{63} - 2 \sqrt{28 } - \sqrt{112}$
simplify the following :​

Answer 1

$3 \sqrt{63} - 2 \sqrt{28 } - \sqrt{112}$

→ $3 \sqrt{7×9} - 2 \sqrt{4×7 } - \sqrt{16×7}$

→ $3×3\sqrt{7} - 2×2\sqrt{7} - 4\sqrt{7}$

→ $9\sqrt{7} - 4\sqrt{7} - 4\sqrt{7}$

→ $9\sqrt{7} - 8\sqrt{7}$

→ $\sqrt{7}$