3 years ago

The sum of the first 7 terms of a geometric sequence is 16383.

Mathematics

1 answer:

gogolik [260]3 years ago

4 0

UNFINISHED ANSWER - PRESSED ENTER TOO EARLY. SORRY

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A answer could be 19 divided by 3

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What are the x-intercepts of the function f(x) = -2x2 – 3x + 20?

Murljashka [212]

Answer:

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I guess

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2 years ago

Can someone help me with this

jarptica [38.1K]

The answer is:

x=-8

Because:

If you pick a number(-8) to fill in the equation written below

5x+20+5x=5x-20

After applying the -8 to x you get

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When you simply the both sides you get

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<img src="https://tex.z-dn.net/?f=1%20%2B%20%20log_%7B2%7D%28x%20-%202%29%20%20%3D%20%20%20log_%7B2%7Dx" id="TexFormula1" title=

fenix001 [56]

Move all the logarithms on the left hand side, and all the constants on the other:

$\log_2(x-2) - \log_2(x) = -1$

Use the rule of logarithms

$\log_a(b) - \log_a(c) = \log_a\left(\dfrac{b}{c}\right)$

To rewrite the equation as

$\log_2\left(\dfrac{x-2}{x}\right) = -1$

Evaluate 2 to the power of each side:

$\dfrac{x-2}{x} = 2^{-1} = \dfrac{1}{2}$

Multiply both sides by 2x:

$2(x-2) = x \iff 2x-4 = x \iff x = 4$

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Answer:

can't understand the question.

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