Cho f(x) = ax+b xác định a+b bt f(x-1)=-x+3 vs mọi R

Question

Cho f(x) = ax+b xác định a+b bt f(x-1)=-x+3 vs mọi R

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Sapo 4 years 2020-10-14T23:25:27+00:00 2 Answers 118 views 0

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  1. Calantha
    0
    2020-10-14T23:26:35+00:00
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    .
    cho-f-a-b-ac-dinh-a-b-bt-f-1-3-vs-moi-r

  2. Orla
    0
    2020-10-14T23:26:36+00:00
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    $f(x-1)=a(x-1)+b$

    $=ax-a+b$

    $\Rightarrow a=-1; -a+b=3$

    $\Leftrightarrow b=2$

    Vậy $(a;b)=(-1;2)$

    $\to a+b=1$

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