Question
wing: \( f(x)=\frac{2 x+5}{5}-2 \) b. What is the input when \( f(x)=-3 \)
Ask by Floyd Hammond. in the United States
Jan 23,2025
Real Tutor Solution
Tutor-Verified Answer
Answer
When \( f(x) = -3 \), the input is \( x = -5 \).
Solution
To find the input \( x \) when \( f(x) = -3 \) for the function:
\[
f(x) = \frac{2x + 5}{5} - 2
\]
**Step 1: Set \( f(x) \) equal to -3**
\[
\frac{2x + 5}{5} - 2 = -3
\]
**Step 2: Add 2 to both sides to isolate the fraction**
\[
\frac{2x + 5}{5} = -3 + 2
\]
\[
\frac{2x + 5}{5} = -1
\]
**Step 3: Multiply both sides by 5 to eliminate the denominator**
\[
2x + 5 = -1 \times 5
\]
\[
2x + 5 = -5
\]
**Step 4: Subtract 5 from both sides to solve for \( 2x \)**
\[
2x = -5 - 5
\]
\[
2x = -10
\]
**Step 5: Divide both sides by 2 to find \( x \)**
\[
x = \frac{-10}{2}
\]
\[
x = -5
\]
**Conclusion:**
When \( f(x) = -3 \), the input is \( x = -5 \).
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Beyond the Answer
To find the input when \( f(x) = -3 \), we set up the equation: \[ -3 = \frac{2x + 5}{5} - 2 \] First, add 2 to both sides: \[ -3 + 2 = \frac{2x + 5}{5} \] \[ -1 = \frac{2x + 5}{5} \] Now, multiply both sides by 5: \[ -5 = 2x + 5 \] Next, subtract 5 from both sides: \[ -5 - 5 = 2x \] \[ -10 = 2x \] Finally, divide by 2: \[ x = -5 \] So, the input when \( f(x) = -3 \) is \( x = -5 \).