P= -4b^2+6b-9 Q= 7b^2-2b-5 P-Q=

Question

P= -4b^2+6b-9
Q= 7b^2-2b-5
P-Q=

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Trung Dũng 3 years 2021-08-28T16:45:39+00:00 1 Answers 21 views 0

Answers ( )

  1. thnahdat
    0
    2021-08-28T16:47:31+00:00
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    Answer:

    P – Q = – 11b² + 8b – 4

    Step-by-step explanation:

    P – Q

    = – 4b² + 6b – 9 – (7b² – 2b – 5) ← distribute parenthesis by – 1

    = – 4b² + 6b – 9 – 7b² + 2b + 5 ← collect like terms

    = – 11b² + 8b – 4

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )