Question

Solve 3x2 = −12x − 15. x = −4 ± 2i x = −4 ± i x = −2 ± 2i x = −2 ± i

Answer 1

x = −2 ± i

Explanation:

I got it right on the test.

Answer 2

Answer: x = −2 ± i

Step-by-step explanation: solution of ax²+bx+c=0 is given by

x= ( -b±√(b²-4ac))/2a

here a=3,b=12 and c=15

⇒ x= (-12±√(12²-4×3×15))/6

⇒ x= (-12±√(144-180))/6

⇒ x= (-12±√(-36))/6

⇒ x= (-12±6i)/6

⇒ x= -2±i