Question

a + b ) ( √ a + √ b ) ( √ a − √ b ) =​

Answer 1

Answer:

√ab = √a * √b holds ONLY IF at least one among a and b is non-negative.

Now that you know, let me present a popular mathematical fallacy based on this.

1 = √1 = √[(-1) * (-1)] = i*i = i^2 = -1.

Could you make out where it went wrong?

Cheers!