Hi,

finding the value of x so that f(2x)=2f(x).

f(x)=x^2+99x+18

    (2x)^2 + 99(2x) + 18 = 2x^2 + 198x + 36

     4x^2 + 198x + 18 = 2x^2 + 198x + 36

             2x^2  - 18 = 0

             x^2 = 9

             x = ± 3 

RELATED QUESTIONS

Need help for Grade 11 functions question:

The function f(x)has the property that... (answered by nyc_function)

Let f(x)=2x^2-5x and find:
A: f(-2)
B: f(0)
C: 2f(x)
D:... (answered by jim_thompson5910)

help!!!!
if f(2x)=4/2+x

calculate... (answered by psbhowmick)

If f(x)=log(1-x/1+x) that show that... (answered by KMST)

If f(2x)=2/(2+x), x>0, find 2f(x).
thank... (answered by josgarithmetic,MathTherapy)

If f(2x)=2/(2+x), x>0, find... (answered by josgarithmetic,MathTherapy)

For all real numbers {{{x}}}, the function {{{f(x)}}} satisfies {{{2f(x) + f(1-x) =... (answered by Edwin McCravy)

how do i graph -2f(x+1)-3 when f(x)= the absolute value of... (answered by stanbon)

f(x)=2x-6 find the value of... (answered by jim_thompson5910)