SOLUTION: Help, how and what does this mean mean? f(x) = 8 + x g(x) = x - 5 If d(x) = f(x) - g(x), find d(x)

Algebra ->  Algebra  -> College  -> Linear Algebra -> SOLUTION: Help, how and what does this mean mean? f(x) = 8 + x g(x) = x - 5 If d(x) = f(x) - g(x), find d(x)       Log On


   

Question 238100: Help, how and what does this mean mean?
f(x) = 8 + x
g(x) = x - 5
If d(x) = f(x) - g(x), find d(x)

Answer by Stitch(187) About Me  (Show Source):
You can put this solution on YOUR website!
This is a substitution problem.
-------
Given:
f(X) = 8 + X
g(X) = X - 5
d(X) = f(X) - g(X), find d(X)
All you need to do now is plug (8 + X) in for f(X) and plug (X - 5) in for g(X) into the d(X) equation.
d%28X%29+=+f%28X%29+-+g%28X%29
d%28X%29+=+%288+%2B+X%29+-+%28X+-+5%29 rewrite the equation
d%28X%29+=+8+%2B+X+-+X+%2B+5 Add like terms
highlight%28d%28X%29+=+13%29