What number should be subtracted from x3 + 4x2 - 7x + 12 if it is to be perfectly divisible by x + 3?
42
39
13
None of these

• Use Remainder Theorem.
  
  If f(x) is divided by (x - a), the remainder is given by f(a).
  
  f(x) = x³ + 4x² - 7x + 12 and a = -3.
  
  f(a) = (-3)³ + 4(-3)² -7(-3) + 12
  
  = -27 + 36 + 21 + 12 = 42
  
  => 42 should be subtracted from given function to make divisible by (x + 3)
  
  :-)
• 4 years agoHelpfull: Yes(0) No(0)