Question

If 16 - 2 = 2, 9 - 3 = 0, 81 - 1 = 8, then what is 64 - 4 ?
Option 1 : 4
Option 2 : 2
Option 3 : 6
Option 4 : 8

Answer 1

Hey mate!!!

Here's your answer!!

Let's take every given equation one by one.

16-2 = 2
Here,
$16 = {4}^{2}$
And so:
$4 - 2 = 2$
That means, in every given equation, the first number is a square of any number and when we'll subtract the square root of that first number by the next number, we'll get the correct answer.
Understand it better by solving it:

9-3 =0
$9 = {3}^{2}$
And so,
$3 - 3 = 0$


Next one:
81-1 =8
$81 = {9}^{2}$
And so:
$9 - 1 = 8$

And the answer thus, comes:

64-4
$64 = {8}^{2}$
And:
$8 - 4 = 4$
Therefore, the answer is 4.

Hope it helps!!
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