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Eva8 [605]
3 years ago
10

Given the function f(x) = 2x + 5, what would the input be with an output of 21

Mathematics
2 answers:
Pepsi [2]3 years ago
8 0

<u>Given</u><u> </u><u>:</u><u>-</u>

  • f(x) = 2x + 5

<u>To </u><u>Find</u><u> </u><u>:</u><u>-</u>

  • The input when output is 21 .

<u>Answer </u><u>:</u><u>-</u>

The given function is ,

  • f(x) = 2x + 5

Substitute f(x) = 21 ,

  • 21 = 2x + 5
  • 21 - 5 = 2x
  • 16 = 2x
  • 16/2=x
  • x = 8
REY [17]3 years ago
6 0

Answer:

input = 8

Step-by-step explanation:

x is the input and f(x) is the output

Given f(x) = 2x + 5 and f(x) = 21 , then equating gives

2x + 5 = 21 ( subtract 5 from both sides )

2x = 16 ( divide both sides by 2 )

x = 8

That is the input is 8

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