Hi here is my problem

$\displaystyle Let $\mathbf{A}\text{ be an }n\,$$\times \,n$$\text{ skew-symmetric matrix and }\mathbf{x}\text{ be an }n\,$$\times$$\,1$$\text{ vector. Show that }\mathbf{x^TAx}=0$ for all $\mathbf{x}\in\mathbb{R}^n$.$ my professor said it was a two line proof using A^T=-A and (AB)^T=B^T*A^T but with that information it seems like it is not enough. any help would be great.

i figured it out, now how do i delete this post?!