Question

Solve the equation. |k + 9| = 4

Answer 1

hint:

if

|x| = k

then

x = k or x = -k

where k is some positive number

Answer 2

A.


{–13, –5}


B.


{–5, 5}


C.


{–5, 13}


D.


{all real numbers greater than or equal to –13 and less than or equal to –5}

Answer 3

So A right?

Answer 4

Substitute answers into equation and see which is OK.
Observe what would happen with -5 and -13.

Answer 5

So is A wrong?