2 years ago

Select the correct answer.

Mathematics

1 answer:

SSSSS [86.1K]2 years ago

4 0

Ahah coco die sucks math

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3 years ago

Solve for x : log(3x) + log(x + 4) = log(15).<br><br>Please explain it to me.

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Answer:

x = 1

Explanation:

$\sf \rightarrow log(3x) + log(x + 4) = log(15)$

Rule: log(a) + log(b) = log(ab)

$\sf \rightarrow log(3x(x + 4)) = log(15)$

cancel out log on both sides

$\sf \rightarrow 3x(x + 4) = 15$

relocate constant variable

$\sf \rightarrow 3x^2 + 12x -15 = 0$

take 3 as a common factor

$\sf \rightarrow 3(x^2 + 4x -5) = 0$

divide both sides by 3

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set to zero

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relocate variables

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There must be a positive solution for log, so the solution is only x = 1

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1 year ago

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