document.write( "Question 1016874: Let u and v be the vectors of length 3 and 5, respectively. Suppose u . v = 8. Find (-3u+4v) . (2u+5v). \n" ); document.write( "
Algebra.Com's Answer #633253 by robertb(5830)![]() ![]() You can put this solution on YOUR website! u*u = square of the length of vector u, and \n" ); document.write( "v*V = square of the length of vector v.\r \n" ); document.write( "\n" ); document.write( "==> (-3u+4v)*(2u+5v) = -6u*u-15u*v+8u*v+20v*v = -6*9 - 15*8 +8*8 +20*25 = 390. \n" ); document.write( " |