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Let\(f(x) = \left\{ \begin{array}{cl} x^2+1 &\text{ if }x>5, \\ 2x-3 &\text{ if } -5 \le x \le 5, \\ 3 &\text{ if } x <-5. \end{array} \right.\)Find \(f(-7)+f(0)+f(7).\)

 Apr 20, 2021
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f(-7) = 3       from the definition

f(0)   = 2(0) -3   = -3

f(7) = 72 + 1                                                sum = 50

 Apr 20, 2021

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