Question

Seja : f(x)=3x+1
 Determine .:
f (235) - f (129) 
       106 
    #E IGUAL A ? 

Answer 1

$\bullet f(x) = 3x + 1 \\\\ \circ f(235) = 3 \cdot 235 + 1 \\ f(235) = 706 \\\\ \circ f(129) = 3 \cdot 129 + 1 \\ f(129) = 388 \\\\ \bullet \frac{f(235) - f(129)}{126} \rightarrow \frac{706 - 388}{126} = \frac{318}{126} = \boxed{\frac{53}{21}}$