algebra 2 help! please explain how to do it.?

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30x^2 + 72x = -54
A x = (5 +- 6i)/-5
B x = (6 +- 3i)/30
C x = (5 +- -3i)/6
D x = (-6 +- 3i)/5
E x = (9 +- 6i)/-5
F x = (-9 +- 3i)/-6

2007-05-11 05:36:14 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics

30x² + 72x + 54 = 0
5x² + 12x + 9 = 0
Use the Quadratic formula, with a = 5, b = 12 c = 9.
x = [-b ±√(b² - 4ac)] / 2a.

2007-05-11 06:22:57 · answer #1 · answered by Anonymous · 0⤊ 0⤋

5xÂ² + 12x + 9 = 0
x = [-12 Â± â(144 - 180)] / 10
x = [-12 Â± â( - 36)] / 10
x = [ -12 Â± 6i ] /10
x = [- 6 Â± 3i] / 5
ANSWER D

2007-05-12 11:32:29 · answer #2 · answered by Como 7 · 0⤊ 0⤋