Question

Solve 3x2 = -12x - 15.

x = -4 ± 2i

x = -4 ± i

x = -2 ± 2i

x = -2 ± i

Answer 1

@mikeyymonroe

Answer 2

In the 3x2 part, is your "x" supposed to be for a variable or multiplication? :)

Answer 3

no sorry it is 3x^2

Answer 4

Kk :)

Answer 5

so like this 3x²

Answer 6

yes!

Answer 7

divide every term by 3

gives

\[x^2 = -4x - 5\]

for my preferred method I'd add 4x to both sides of the equation to get

\[x^2 + 4x = -5\]

then complete the square

then solve... you you can use the general quadratic formula after adding 5 to both sides of the equation... different methods, but you'll get the same solutions.

Answer 8

thanks!