math (how do i solve the last part)
posted by Keisha on .
The functions f and g are defined by:
f:x 3x2
g:x 2x+5
Evaluate:g(6), fg(3)
g(6)= 2(6)+5= 7
fg(3)= 3(2x+5)2
6x+152
6(3)+13 = 31
Evaluate f(x)=8, calculate the value of x

Your "last part" is to determine the value of x when
f(x) = 3x 2 = 8
Just solve that last equation for x.
The answer is
x = 10/3