Question

if √5=2.236 and √10=3.162, evaluate 15/√10+√20+√40-√5-√80

Answer 1

Here
given
√5 = 2.236
√10 = 3.162
So,
Putting values ,
√10+√20+√40+√5+√80 →↓
3.162+6.324+12.648+2.236+25.296 = 49.666