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f(x)= -x^2 -4x - 19Find f(-9)

Sagot :

[tex]f(-9)=-64[/tex]

Explanation

[tex]f(x)=-(x^2)-4x-19[/tex]

Step 1

F(-9)

replace the value of x

[tex]\begin{gathered} f(x)=-(x^2)-4x-19 \\ f(-9)=-((-9)^2)-(4\cdot-9)-19 \\ f(-9)=-(81)-(-36)-19 \\ f(-9)=-81+36-19 \\ f(-9)=-81+36-19 \\ f(-9)=-64 \end{gathered}[/tex]

I hope this helps you