You can
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f(x) = x² + 2x - 7
Spread it way apart like this:
f( x ) = x ² + 2 x - 7
Erase all the x's
f( ) = ² + 2 - 7
Put (x-h) where the x's were
f((x+h)) = (x+h)² + 2(x+h) - 7
We don't need double parentheses on the left,
so we make them single parentheses:
f(x+h) = (x+h)² + 2(x+h) - 7
You can leave it like that or you can multiply
the expressions out on the right.
f(x+h) = x² + 2hx + h² + 2h + 2x - 7
Edwin
