Question

root 45 - 3 root 80 + 7 root 5

Answer 1

Answer:

-2root5

Step-by-step explanation:

$\sqrt{45} - 3\sqrt{80} + 7\sqrt{5}$

=  $\sqrt{9 \times 5} - 3 \sqrt{16 \times 5} + 7\sqrt{5}$

=  $3\sqrt{5} - 12\sqrt{5} +7\sqrt{5}$

 $=10\sqrt{5} - 12\sqrt{5}\\ = -2 \sqrt{5}$

Hope it helps

Please mark as brainliest