Question

I need to find the error in the equation

Answer 1

20 - i

Explanation:

The error made during second step:

When adding or subtracting expression, we add or subtract like terms.

(16 - 3i) + (4 + 2i) get rid of parenthesis

16 - 3i + 4 + 2i add/subtract like terms

20 - i (the mistake is made here, instead of "i" they typed i^2)

Answer 2

20 - i

Explanation:

Addition of complex numbers:

In complex number addition/subtraction, add the imaginary part and add the real part separately.

The error is while adding imaginary part, you have to combine the coefficients of the imaginary numbers. So, -3 +2 will give us -1. So, the result is -i.

16 - 3i + 4+ 2i = 16 + 4 -3i + 2i

= 20 - i