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3 years ago

The geometric mean of x+3 and 4x+1 is 2x+1. Find all possible values of x.

Mathematics

1 answer:

Anastaziya [24]3 years ago

4 0

Answer:

$x = - \frac{2}{9}$

Step-by-step explanation:

Since, the geometric mean of x+3 and 4x+1 is 2x+1.

Therefore, by geometric mean theorem:

${(2x + 1)}^{2} = (x + 3)(4x + 1) \\ \\ \cancel{4 {x}^{2}} + 4x + 1 = \cancel{4 {x}^{2}} + x + 12x + 3 \\ \\ 4x + 1 = 13x + 3 \\ \\ 4x - 13x = 3 - 1 \\ \\ - 9x = 2 \\ \\ x = - \frac{2}{9}$

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Learn more about law cosine here;

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