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galina1969 [7]
3 years ago
6

Find all the zeroes of the equation. –3x4+ 27x2 + 1200 = 0

Mathematics
1 answer:
ryzh [129]3 years ago
4 0

Answer:

x = ±5, x = ±4i

Step-by-step explanation:

-3x⁴ + 27x² + 1200 = 0

Divide both sides by -3.

x⁴ − 9x² − 400 = 0

Factor using AC method.

(x² − 25) (x² + 16) = 0

Set each factor to 0.

x² − 25 = 0, x² + 16 = 0

Solve for x.

x² = 25, x² = -16

x = ±5, x = ±4i

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By formula we know that:

z (x) = (x - m) / [sd / sqrt (n)]

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Replacing we have:

z (6.7) = (6.7 - 5) / [7.1 / sqrt (29)]

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Now the hypothesis tells me:

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3 years ago
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4 years ago
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3 years ago
A set of bivariate data was used to create a least-squares regression line. Which of the following is minimized by the line? The
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