Question

Let f(x) = 2x - 3. If f(x) = 15, what is x?

Answer 1

To find the value of input value 'x' of the function substitute the value of output value f(x) in the given function.

    If f(x) = 2x - 3 and we have to find the values of 'x' for f(x) = 15

    Substitute the value of f(x) in the given function,

15 = 2x - 3

2x = 15 + 3

2x = 18

x = 9

• If g(x) = 3x + 2
• For g(x) = 11

11 = 3x + 2

3x = 11 - 2

3x = 9

x = 3

• If w(x) = 3x - 7
• For w(x) = 14

114 = 3x - 7

3x = 21

x = 7

• If h(x) = -2x - 5
• For h(x) = -25

-25 = -2x - 5

25 = 2x + 5

2x = 20

x = 10

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