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4 votes
4 votes
2. A function fis given by f: x→ 5x-8, where x € R. Find

a. f(-4)
b. the value of x whose image is 12

User Mike Ottum
by
2.5k points

1 Answer

7 votes
7 votes

Answer:

a. -28

b. 4

Explanation:

f: x→ 5x-8

a. f(-4) = 5(-4) - 8 = -20 - 8. = -28

b. the value of x whose image is 12

To find the value of x ,we have to solve f(x) = 12

f(x) = 12

⇔ 5x-8 = 12

⇔ 5x = 12 + 8

⇔ 5x = 20

⇔ x = 20 ÷ 5 = 4

User Tyranid
by
3.3k points
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