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poizon [28]
2 years ago
6

What are the solutions of the equation 9x4 – 2x2 – 7 = 0? Use u substitution to solve.x = + √7/9 and x = ±1 x = + √7/9 and x = ±

i x = +i √7/9 and x = ±1 x = +i √7/9 and x = ±I 
Mathematics
2 answers:
snow_tiger [21]2 years ago
6 0

Answer:

Step-by-step explanation:

9x⁴ – 2x² – 7 = 0

Let's say that u = x²:

9u² – 2u – 7 = 0

Factor:

(u – 1) (9u + 7) = 0

u = 1, -7/9

Since u = x²:

x² = 1, -7/9

x = ±1, ±i √(7/9)

Andre45 [30]2 years ago
3 0

Answer:

the answer is c on edgenunity

Step-by-step explanation:

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The formula that relates the length of a ladder, L, that leans against a wall with distance d from the base of the wall and the
Ulleksa [173]

Answer:

Step-by-step explanation:

The formula that relates the length of a ladder, L, that leans against a wall with distance d from the base of the wall and the height h that the ladder reaches up the wall is L = StartRoot d squared + h squared EndRoot. What height on the wall will a 15-foot ladder reach if it is placed 3.5 feet from the base of a wall?

L = √d² + h²

4 0
1 year ago
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Plato explains that we know geometry by _________.
sasho [114]

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2 years ago
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Step-by-step explanation:

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1 year ago
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L = loudness, in decibels (dB); I = sound intensity, in watts/m2; I0 = 10−12 watts/m2
irina [24]
The sound intensity of the Pile Driver is 39.5
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Given with Loudness in dB for pile driver = 112 dB
We have to convert it in terms of sound intensity.
First,
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Then we'll use this as exponent of 10
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Then use the equation of Watts per square meter to find the intensity:
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2 years ago
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allsm [11]

Step-by-step explanation:

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