Question

4)Dada a função f(x)= -2x+11, encontre:

a) f ( 4 )

b) f ( - 3 )

c) f ( 9 )

d) f ( -7 )

Answer 1

a)

$f(x) = - 2x + 11 \\ f(4) = ( - 2 \times 4 )+ 11 = - 8 + 11 = 3$

b)

$f( - 3) = ( - 2 \times - 3) + 11 \\ f( - 3) = 6 + 11 = 17$

c)

$f(9) = ( - 2 \times 9) + 11 \\ f(9) = - 18 + 11 = - 7$

d)

$f( - 7) = ( - 2 \times - 7) + 11 \\ f( - 7) = 14 + 11 = 25$