Joelle was asked to find the missing endpoint of a segment when given an endpoint of –6 +3i and a midpoint of –13 + i. her work is shown below.

her mistake

a. not subtracting the a and b in the original equations.

b. writing the final answer as 1+ 5i instead of 5 + i.

c. switching the endpoint and midpoint in her original equations.

d. not using –6 and 3 in one of her original equations and –13 and 1 in the other original equation.

C

Step-by-step explanation:

middle point is 20-i

C. switching the endpoint and midpoint in her original equations.

Step-by-step explanation:

One endpoint is –6 +3i

The other endpoint is a + bi (where a and b are unknown)

The midpoint is -13 + i. Its coordinates are obtained as follows:

coordinate of the midpoint = (coordinate of one endpoint + coordinate of the other endpoint)/2

For this case:

-13 = (-6 + a)/2

1 = (3 +b)/2

make sure you have version 2.50

try looking in the very back of the book : )

step-by-step explanation:

you can download it here