Question

which of these numbers is a square number
4x10^5
9x10^4
4x10^3
9x10^3

Answer 1

Answer:

here 9*10^4 is a square number

Step-by-step explanation:

9*10^4 = 90000

and it is a square of 300

Answer 2

Option B is correct. The required answer is $3 \times 10^2$

For us to know which one is a square number, we must be able to find its square root as shown:

The power of 10 of the scientific value must be even for the number to be a square number. From the options given, 9x10^4 has an even exponent.

Find the square root

$\sqrt{9\times10^4} = 3\times \sqrt{10^4} = 3 \times 10^2$

Hence the required answer is $3 \times 10^2$

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