Solve 3x² = −12x − 15. a.x = −4 ± 2i b.x = −4 ± i c.x = −2 ± 2i d.x = −2 ± i

asked Sep 5, 2024 181k views

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Answer:

HI,

Answer: D x=-2-i or x=-2+i

Explanation:

$3x^2=-12x-15\\\\3x^2+12x+15=0\\x^2+4x+5=0\\\Delta=4^2-4*5=16-20=-4=4*i^2\\\\x=(-4+2i)/(2) \ or\ x=(-4-2i)/(2) \\\\x=-2+i\ or\ x=-2-i\\$

Airfang answered Sep 9, 2024

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