Would someone be able to help me on this problem? 
Given f(x) = -2x - 4, find f(-3) 
Thanks so much,
Ashley


f(x) = -2x - 4

Put parentheses around all x's that 
aren't already enclosed in parentheses:

f(x) = -2(x) - 4

Erase all the x's:

f(  ) = -2(  ) - 4

Put -3 in all the empty parentheses:

f(-3) = -2(-3) - 4  

Simplify the right side, leaving the left
side as it is:

f(-3) = 6 - 4

f(-3) = 2

That's all there is to it!  It only 
amounts to substituting what is in the 
parentheses on the left for x in the right 
side. Then simplify.

Edwin