Question

Evaluate
pls answer I'll mark you as branliest​

Answer 1

Answer:

note- instead of symbol 'root' the word root will be used.

root 10 = root 2 x 5

root 20 = root 4 x 5 = root 4 x root 5 = 2root5

root 40 = root 4 x 10 = root 4 x root 10 = 2root10

similarly, -root80 = root 5 x root 16 = -4root5  

As all the surds have been simplified now just substitute the values of root 5 and 10. we obtain,

15 / 3.162 + 2 x 2.236 + 2 x 3.162 - 2.236 - 4 x 2.236 = 15/2.778 = 5.40