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22-09-2016
Mathematics

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

Respuesta :

09-03-2019

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

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