Questions asked by Freed M.

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• Show that if A and B are square matrices such that #AB = BA# then: #(A+B)^2=A^2+2AB+B^2#?
  
• Suppose that A and B are matrices of n X n. Show that if A is reversible, then then the #det⁡ (B) = det(A ^ (- 1) BA)# ?
  
• (ll) Find a matrix A of 3 X 3 different from zero such that A = A ^ T?
  
• Show that the set is a vector space in the field of real numbers?
  
• Determines the volume that originates the surface bounded by the parabola and the line when turning around the axis Y?
  
• helpme please: A spring of 3 fts requires a force of 10 pounds to stretch it to a length of 3.5 fts a) Find the work required to stretch the spring from its natural length to a length of 5 fts?
  
• Years ago the barges that traveled along the canals were dragged by horses. Suppose that the horse is exerting a force of 7900 N at an angle of 18 degrees with the direction of movement of the barge, which is sailing in a straight line through the channe?
  
• Help me please, Two particles each of mass m, are joined by a thin string of length 2L, as shown in Figure 48. A uniform force F is applied in the middle of the string (x = 0) forming a right angle with the initial position of the string. Show that th????
  
• Determine if F is a linear transformación f(x,y,z)=(x,x+y+z) ?
  
• Help with linear algebra ,Let T: P2 - + P3 be the linear transformation defined by T (p (x)) ?
  
• Help with the next complex variable limit?