Question

.Evaluate : a) √−5127293
b) √125×64

Answer 1

very simple

a)3

512×729

=

3

8×8×8×9×9×9

=8×9

=72

b)On prime factorising, we get,

125=5×5×5 =5

3

64=2×2×2×2×2×2=4×4×4 =4

3

.

Then,

3

125×64

=

3

5

3

×4

3

=5×4=20.

Therefore, 20 is the solution.