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Consider the function below.
f(x) = 2 - 5x - x2
Evaluate the difference quotient for the given function. Simplify your answer.
(f(3 + h) - f(3))/h

Sagot :

Given function in the question is,

[tex]f(x)=2-5x-x^2[/tex]

To find the difference coefficient for the given function, we use the expression as [tex]\frac{f(3+h)-f(3)}{h}[/tex].

[tex]f(3+h)=2-5(3+h)-(3+h)^2[/tex]

             [tex]=2-15-5h-(9+h^2+6h)[/tex]

             [tex]=(2-15-9)-(5h+6h)-h^2[/tex]

             [tex]=-22-11h-h^2[/tex]

             [tex]=-(22+11h+h^2)[/tex]

[tex]f(3)=2-5(3)-(3^2)[/tex]

       [tex]=2-15-9[/tex]

       [tex]=-22[/tex]

Now substitute these values in the expression for the difference coefficient,

[tex]\frac{f(3+h)-f(3)}{h}=\frac{-(22+11h+h^2)-(-22)}{h}[/tex]

                 [tex]=\frac{-22-11h-h^2+22}{h}[/tex]

                 [tex]=\frac{-11h-h^2}{h}[/tex]  

                 [tex]=-(11+h)[/tex]

     Therefore, Value of the difference quotient for the given function is[tex]-(11+h)[/tex].

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