Question

simplify 7√20+4√45-3√5​

Answer 1

Answer:

7

$7 \sqrt{20} \: + \: 4 \sqrt{45} \: - 3 \sqrt{5}$

=

$7 \sqrt{2 \times 2 \times 5} + 4 \sqrt{3 \times 3 \times 5} - 3 \sqrt{5}$

=

$14 \sqrt{5} + 12 \sqrt{5} - 3 \sqrt{5}$

=

$23 \sqrt{5}$

Answer 2

Answer:

answer is 23√5

Step-by-step explanation:

$7 \times \sqrt{4 \times 5} + 4 \sqrt{9 \times 5} - 3 \sqrt{5} \\ and \\ 7 \times 2 \sqrt{5 } + 4 \times 3 \sqrt{5} - 3 \sqrt{5} \\ so \\ 14 \sqrt{5 } + 12 \sqrt{5} - 3 \sqrt{5} \\ so the \: answer \: is \: 23 \sqrt{5}$