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

x=3-3i

x=-3+3i

x=-6+3i

x=6-3i

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

campbell_st · Answer

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.

anonymous · Answer

I never understood how to understand completing the square

campbell_st · Answer

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.

campbell_st · Answer

thats the start, does it make sense...

anonymous · Answer

okay so i need to add 3 to both sides?

campbell_st · Answer

no you need to add 9 to both sides

imtiaz7 · Answer

@AmandaMichelle  by solving your question by quadratic formula we obtain following values of x:|dw:1384454040022:dw|