Question

Is the work shown below correct? Explain your answer. (11 + 2i ) – (3 – 10i ) = 11 + 2i – 3 – 10i = (11 – 3) + (2i – 10i) = 8 – 8i

Answer 1

No the work is incorrect, because the student changed the 10i to a -10i in step 2.

Explanation:

Correct on edge 2022

Answer 2

Incorrect

Explanation:

We are given that

(11+2i)-(3-10i)

We have to find that work shown in question is correct or not.

(11+2i)-(3-10i)

=11+2i-3+10i (Using distributive property :
`a\cdot (b+c)=a\cdot b+a\cdot c`)

=(11-3)+(2i+10i)

=8+12i

Hence, the work shown is wrong because in step 2 write -10i instead of 10i.

Answer :Incorrect