Solve the equation 10-3x-x2 = 0

  • A x=2 or-5
  • B x= -2 or 5
  • C x = 1 or 10
  • D x = 2 or 5
waec 2004mathematics

The correct answer is A. x=2 or-5

10 – 3x - x2 = 0; 10 – 5x + 2x - x2 = 0

5(2 – x) + x(2 – x) = 0; (2 – x)(5 + x) = 0

2 – x = 0 or 5 + x = 0; x = 2 or x = -5

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