Question

PLEASE HELP ME!

The point (-2,k) lies on the circle x2+y2=20. Determine the values of k. Show all steps in the solution.

Answer 1

Plug (x,y) = (-2,k) in to the equation x^2 + y^2 = 20

\((-2)^2 + (k)^2 = 20\)
\(4 + k^2 = 20\)
\(k^2 = 16\)
\(k = ±4\)

Answer 2

how did u get 16?

Answer 3

by subtracting 4 from both sides

Answer 4

and that gives u 4 in the end then.

Answer 5

how did u get 4 in the end?

Answer 6

The steps are posted above