Question

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Part 1 of 3
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Given the following functions, find the indicated values.
f(x)=8-4x
(a) f(-7) (b) f(0) (c) f(4)
(a) f(-7)=

Answer 1

• a) f(-7) = 36
• b) f(0) = 8
• c) f(4) = -8

Explanation:

a) f(-7) = ?

→ f(x) = 8 - 4x

→ f(-7) = 8 - 4(-7)

→ f(-7) = 8 + 28

→ f(-7) = 36

Hence, f(-7) = 36.

b) f(0) = ?

→ f(x) = 8 - 4x

→ f(0) = 8 - 4(0)

→ f(0) = 8 - 0

→ f(0) = 8

Hence, f(0) = 8.

c) f(4) = ?

→ f(x) = 8 - 4x

→ f(4) = 8 - 4(4)

→ f(4) = 8 - 16

→ f(4) = -8

Hence, f(4) = -8.

Answer 2

• (a) 36, (b) 8, (c) - 8

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Given function

• f(x) = 8 - 4x

Find the indicated values

(a) f(-7)

• f(-7) = 8 - 4(-7) = 8 + 28 = 36

(b) f(0)

• f(0) = 8 - 4(0) = 8 - 0 = 8

(c) f(4)

• f(4) = 8 - 4(4) = 8 - 16 = - 8