What is the value of the product (3 – 2i)(3 + 2i)?

= 13

Step-by-step explanation:

(3 - 2i)(3+2i) = 9 + 6i - 6i -4i^2

i^2 = -1  so then it’s

9 +-4(-1)

= 9 + 4

= 13

yx = 36

step-by-step explanation:

cos f = opposite side/ hypotenuse

cos f = yw / yx

we know cos f = 4/9 and yw =16

4/9 = 16/yx

multiply each side by yx

4/9 yx = 16/ yx * yx

4/9 yx = 16

multiply each side by 9/4

9/4 * 4/9 yx = 16 *9/4

yx = 36