Let's take these problems step-by-step:
To solve these problem, simply plug in the values in parentheses in front of f:
[tex]f(a) = 6a - 8\\\\f(a+h) = 6(a+h)-8=6a + 6h - 8\\\\\frac{f(a+h)-f(a)}{h} =\frac{(6a+6h-8)-(6a-8)}{h} =\frac{6a+6h-8-6a+8}{h} =\frac{6h}{6}=h[/tex]
Hope that helps!
#LearnwithBrainly!
