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Messier Notation

What about this one?

If f( x ) = 3x - 2x^2

Find  f(blob):

f( blob ) = 3( blob ) - 2( blob )^2
 

Find  f(zebra):

f( zebra ) = 3( zebra ) - 2( zebra )^2
 

Find  f(x+h):

f( x + h ) = 3( x + h ) - 2( x + h )^2 ... = 3x + 3h - 2( x + 2xh + h )^2 ... = 3x + 3h - 2x^2 - 4xh - 2h^2 ... See how important the ( ) are?

Always do the blob thing and use ( ) and you'll never go wrong!

TRY IT:

If  f( x ) = 4x^2 - x
   
Find  f( blob )
Find  f( x + h )