Question

If f(x)=6x-15 and f(a)=30, what is the value of a?
Please help

Answer 1

`a=7.5`

Explanation:

Given the function
`f(x)=6x-15` and the output
`30` when
`x=a`, we can write the equation:

`6a-15=30`

`6a=45`

`a=7.5`

We can insert the value of
`a` into the function to verify the output equals
`30`:

`f(a) = 6a-15`

`= 6(7.5)-15`

`=30`

∴ We have verified that
`a=7.5`

Hope this helps :)