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6a-3b
Factorize not sure what i am doing here? Find a basis of the subspace of R4 that consists of all vectors perpendicular to both [1,0,0,7] and [0,1,-9,5]. Please show work!? Calculus help? limit as x approaches negative infinity of (sqrt(9x^2+x)) -3x? Find the indicated limit, if it exists. lim f(x), x approaches 9 {x+9 , x < 9} { 27-x , x>9}? Find the point (x,y) of x^2+14xy+49y^2=100 that is closest to the origin and lies in the first quadrant.?