Question

1)simplify
$3 \sqrt{7} + 7 \sqrt{63} - \sqrt{7}$
very fast​

Answer 1

23√7

Step-by-step explanation:

$3 \sqrt{7} + 7 \sqrt{63} - \sqrt{7}$

$2 \sqrt{7} + 7 \sqrt{7 \times 3 \times 3}$

$2 \sqrt{7} + 3 \times 7 \sqrt{7}$

2√7 + 21√7

23√7