Question

√625-8 3√125+ 4√81+15 5√32( its for 4 marks)​

Answer 1

i ) √625 = √25² = 25

ii ) cubeth root 125

= ( 5³ )^1/3 = 5

iii ) fourth root of 81

= ( 3⁴ )^1/4

= 3

iv ) 5th root of 32

= ( 2^5 )^1/5

= 2

Now ,

√625 -8(125)^1/3+(81)^1/4+15(32)^1/5

= 25 - 8×5 + 3 + 15 × 2

= 25 - 40 + 3 + 30

= 18