Anyone who has never made a mistake has never tried anything new. Albert Einstein Describe y as the sum of two orthogonal vectors, x_1 in span{u} and x_2 orthogonal to u. Leave a tip for good service: https://paypal.me/jjthetutor Download my eBooks via http://payhip.com/jjthetutor and paperback via http://amazon.com/author/jjthetutor