Question

please answer question number 15.​

Answer 1

Answer:

$\frac{15}{ \sqrt{10} + \sqrt{20} + \sqrt{40} - \sqrt{5} - \sqrt{80} } \\ = \frac{15}{ \sqrt{10} + 2 \sqrt{5} + 2 \sqrt{10} - \sqrt{5} - 4 \sqrt{5} } \\ = \frac{15}{3 \sqrt{10} - 3 \sqrt{5} } \\ = \frac{5}{ \sqrt{10} - \sqrt{5} } \\ \frac{5}{3.1622 - 2.2360} \\ = \frac{5}{0.9296} = 5.3786 \: \: ans$

Here is your solution. Thanks ❤️

Answer 2

Step-by-step explanation:

by simplifying

15/√10+2√5+2√10-√5-4√5

15/3√10-3√5

by rationalitionising the denominator

45(√10-√5)/90-45

no we get

√10-√5

0.926