Dear market,
Could you please clarify what is being squared? Use the ^ symbol to indicate exponents (powers), and use parentheses to group what is being squared and what is being divided by 2. For example:
[(x + h)(x + h) - 4x^2] / 2
4x^2 means "4 x squared", where only the x is getting squared, then I grouped the whole expression in [ ] brackets because the whole thing is being divided by 2.
Is this the expression you're asking about?
Also, is it an expression (comes with no = sign) or an equation (comes with an = sign)? It matters because in the former case, you simplify (not solve) and in the latter case you simplify and solve.
Another note: You have to FOIL when you multiply binomials, so
\(\displaystyle $(x+h)(x+h)=x^2+xh+xh+h^2=x^2+2xh+h^2$\)
--K