f(x)=3-5x (a) f(-1) b f(1) c f(2)?

Question

with the folowing functions,find the indicated values

Answer 1

f(x) = 3 - 5x

a) f(-1)

To solve f(-1), just plug in (-1) for every occurrence of x.

f(-1) = 3 - 5(-1)
f(-1) = 3 + 5
f(-1) = 8

b) f(1)

f(1) = 3 - 5(1)
f(1) = 3 - 5
f(1) = -2

c) f(2)

f(2) = 3 - 5(2)
f(2) = 3 - 10
f(2) = -7

Answer 2

f(x)=3-5x
(a) f(-1) = 3-5(-1) = 3 + 5 = 8 ==>(-1, 8)
b f(1) = 3-5(1) = 3 - 5 = -2 ==>(1, -2)
c f(2) = 3-5(2) = 3-10 = -7 ==> (2, -7)
::::

Answer 3

f(x) = 3 - 5x

a) f(-1)

for f(-1) replace x by -1

f(x)=3-5x

f(-1) = 3 - 5 (-1)
f(-1) = 3 + 5 (as "-" multiplied by "-" is " + ")
f(-1) = 8

b) f(1)

for f(1) replace x by 1

f(x)=3-5x

f(1) = 3 - 5 (1)
f(1) = 3 - 5 (as "+" multiplied by "-" is " - ")
f(1) = -2

c) f(2)

for f(2) replace x by 2

f(x)=3-5x

f(2) = 3 - 5 (2)
f(2) = 3 - 10 (as "+" multiplied by "-" is " - ")
f(2) = -7