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Question

The sum of integeral roots of the equation (x2+3x)2(x2+3x)6=0 is
  1. 0
  2. 3
  3. 1
  4. 3


Solution

The correct option is D 3
Put x2+3x=y
y2y6=0y=2, 3
Now
Case I: x2+3x=2x=1, 2
Case II: x2+3x=3x=12(3±21)
So the sum of the integral roots of the equation is 3

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