Find All Values of X Satisfying the Given Conditions $y _ { 1 } = \frac { 1 } { x + 4 } , y _ { 2 } = \frac { 1 } { x + 3 } , y _ { 3 } = \frac { - 1 } { x ^ { 2 } + 7 x + 12 }$

question 166

Multiple Choice

Find all values of x satisfying the given conditions.
- $y _ { 1 } = \frac { 1 } { x + 4 } , y _ { 2 } = \frac { 1 } { x + 3 } , y _ { 3 } = \frac { - 1 } { x ^ { 2 } + 7 x + 12 }$ , and the sum of $y _ { 1 }$ and 2 times $y _ { 2 }$ is $y _ { 3 }$ .

• A) \(\{ - 4 \}\)
• B) \(\{ 0 \}\)
• C) \(\{ 3 \}\)
• D) \(\varnothing\)

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