Question

Which of the following is a solution of x2 + 6x = −18?
x = 3 − 3i

x = −3 + 3i

x = −6 + 3i

x = 6 − 3i

Answer 1

it will bbecome
x^2+6x+18
=>now use quadratic formua ..
x=-6+3i

Answer 2

now for this were completing the square..

Answer 3

@zaibali.qasmi

Answer 4

yuppp...complete it like
x2+2(x)(3)+(3)^2-(3)^2+18
=>{(x+3)^2}-9+18
=?(x+3)^2+9

Answer 5

I did it like this x^2+6x=-18
6/2=3^2=9
x^2+6x+9=-18+9
x^2+6x+9=-9

Answer 6

@zaibali.qasmi

Answer 7

Use this formula and you will get it
http://www.mathsisfun.com/algebra/quadratic-equation-derivation.html

Answer 8

And you know that \[\sqrt{-1}= i\]

Answer 9

yuppp..its too correct..

Answer 10

@brijackson6