Respuesta :

[tex]\bf slope = \cfrac{rise}{run} \implies \cfrac{{{ y_2}}-{{ y_1}}}{{{ x_2}}-{{ x_1}}}\implies \cfrac{f(x_2)-f(x_1)}{x_2-x_1}\leftarrow \begin{array}{llll} \textit{average rate}\\ \textit{of change} \end{array}\\\\ -----------------------------\\\\ f(x)=x^2+3x+5\qquad \begin{cases} x_1=1\\ x_2=3 \end{cases}\implies \cfrac{f(3)-f(1)}{3-1}[/tex]
apologiabiology
that's just the slope between the 2 points

evalue f(1) and f(3)
f(1)=1+3+5=9
f(3)=9+9+5=23

slope between (1,9) and (3,23) is
(23-9)/(3-1)=14/2=7

average rate of change is 7
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