Question

how do you solve 2x^2+72=0

Answer 1

subtract 72 from both sides, what u get ?

Answer 2

did u try ?

Answer 3

its solving a quadratic equation with imaginary solutions.

Answer 4

yes, there are quite a few ways to do that, like there is a quadratic formula, do you wish t use that ?

Answer 5

the way i was making you solve was :
2x^2=-72
x^2 = -36
taking square root on both sides will give you 2 imaginary roots...

Answer 6

what i got was x = (plus minus) 6i

Answer 7

and you're correct,
after taking square root, you get
\(x=\pm\sqrt{-36}=\pm \sqrt {-1}\sqrt{36}=\pm 6i\)