jolo7716
jolo7716 jolo7716
  • 10-08-2020
  • Mathematics
contestada

If the geometric mean of a and 15 is 9√15, find the value of a.

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LazyBun
LazyBun LazyBun
  • 10-08-2020
Answer: a = 81

Explanation:

Geometric mean: sqrt a • b

sqrt a • 15 = 9 sqrt 15
Sqrt 15a = 9 sqrt 15
(Sqrt 15a)^2 = (9 sqrt 15)^2
15a = 81 x 15
a = 81
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