Question

Let f(x) = 3x - 10. Find the value of f(-3).
A. 21
B. -1
C. -19

Answer 1

replace every x term with -3

f(-3) = 3(-3) - 10

f(-3) = -9 - 10

f(-3) = -19

Answer 2

\(\bf f({\color{red}{ x}}) = 3{\color{red}{ x}} - 10\qquad f({\color{red}{ -3}}) = 3({\color{red}{ -3}}) - 10\)