Question

Which of the following is a solution of x^2+6x=-18

x=3-3i

x=-3+3i

x=-6+3i

x=6-3i

Answer 1

well I'd complete the square on the left

and then solve for x.

this would give you 2 solutions, but one would match one of your choices.

Answer 2

I never understood how to understand completing the square

Answer 3

ok... so have a look at the middle term 6x

whats half of 6

then square the answer, thats what you need to add to both sides of the equation.

Answer 4

thats the start, does it make sense...

Answer 5

okay so i need to add 3 to both sides?

Answer 6

no you need to add 9 to both sides

Answer 7

@AmandaMichelle by solving your question by quadratic formula we obtain following values of x: