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17 March, 20:29

P=-4b^2 + 6b - 9

Q = 7b^2 - 2b - 5

P - Q =

+5
Answers (1)
  1. 17 March, 23:56
    0
    -4b^2-7b^2 = - 11b^2 (first term of P-Q).

    6b-2b = 4b (second term of P-Q)

    -9+5 = - 4 (third term)

    Then P - Q = - 11b^2 + 4b - 4 (answer)
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