Powers and Roots Practice Test 5

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Question : 24 of 31

Marks: +1, -0

Given

3√ 5 +√125= 17.88

, then the value of

√80 +6√ 5

is:

22.35
21.66
20.46
13.41

Solution:

Given

3√ 5 +√125= 17.88

⇒3√5+5√5=17.88

∴8√5=17.88

Then,

√80 +6√ 5

=4√5+6√5=10√5

=10/8×17.88

= 5 × 4.47 = 22.35

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