Question

given f(x)=2x-10 determine the value if f(x)=8

Answer 1

Answer:

f(x)=2x-10 ______(given)

f(x)=8 _______(given)

Therefore, according to the above problem

2x-10=8

2x=10+8

2x=18

x=18/2

x=9

9 is the right answer.

Answer 2

The value of the input of a function given the output is found by reversing

the operations of the function.

When f(x) = 8, x is 9.

Reasons:

The given function is; f(x) = 2·x - 10

Required:

The value of x if f(x) = 8

Solution:

When f(x) = 8, we have;

f(x) = 2·x - 10 = 8

Which gives;

2·x - 10 + 10 = 8 + 10 = 18

2·x + 0 = 18

$x = \dfrac{18}{2} = 9$

x = 9

When f(x) = 8, x = 9

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