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Q34

0. In the product of(9x2 + 15 - x) and (-1 - x + x 2 ), if A, Band G are the coefficients of x3 , x2 and x respectively, then the value of (A + B - C) is

  • Option : D
  • Explanation : (9x2 + 15 - x)(-1 - x + x2)
    = -9x2 - 9x3 + 9x4 -15 -15x + 15x2 + x + x2 - x3
    = 9x4 - 10x3 + 7x2 - 14x -15
                A = -10, B= 7, C = -14
    Now, A + B + C = -10 +7 + 14
                                    = 11
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