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evaluate the function f(x)=7x+3 at the given values of the independent variable and simplify
a. f(5) b. f(x+8) c. f(-x)

HELP

Sagot :

[tex]f(x)=7x+3\\\\f(5)\ substitute\ 5\to x\\\\f(5)=7\cdot5+3=35+3=38\\\\\\f(x+8)\ substitute\ x+8\to x\\\\f(x+8)=7(x+8)+3=7x+56+3=7x+59\\\\\\f(-x)\ substitute\ -x\to x\\\\f(-x)=7\cdot(-x)+3=-7x+3[/tex]
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