Finding Values for Which \( f(x)=0 \) In Exercises \( 35, \underline{36}, \underline{37}, \underline{38}, \underline{39}, \underline{40}, \underline{41} \), and \( \underline{42} \), fi values of \( x \) for which \( f(x)=0 \). 35. \( f(x)=15-3 x \) Answer \( \downarrow \) 36. \( f(x)=4 x+6 \) 37. \( f(x)=\frac{3 x-4}{5} \) Answer \( \boldsymbol{*} \) 38. \( f(x)=\frac{12-x^{2}}{8} \) 39. \( f(x)=x^{2}-81 \) Answer * 40. \( f(x)=z^{2}-6 x-16 \) 41. \( f(x)=x^{3}-x \)
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To find the values of \( x \) for which \( f(x)=0 \), you simply set each equation equal to zero and solve for \( x \). For example, in \( f(x) = 15-3x \), set \( 15-3x=0 \), which simplifies to \( x=5 \). Each of these functions has a unique solution that can be determined through basic algebraic manipulation. Now, let’s consider how these functions can be used in the real world! For instance, the function \( f(x) = 4x + 6 \) could model a simple budgeting scenario where \( x \) represents the hours worked and \( f(x) \) the total earnings. Finding when this total is zero could represent the point where you’re not earning any money, helping analyze work versus play balance effectively.
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