Simplify (2 − + 1) + 5 and find its value for a = -2.

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Simplify (2 − + 1) + 5 and find its value for a = -2.

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Thái Dương 3 years 2021-08-24T05:41:53+00:00 1 Answers 12 views 0

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  1. diemkieu
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    2021-08-24T05:42:53+00:00
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    Answer:

    Part A

    a·(a² – a + 1) + 5·a = a³ – a² + 6·a

    Part B

    The value of a·(a² – a + 1) + 5·a, for a = -2 is -24

    Step-by-step explanation:

    Part A

    The given function is a·(a² – a + 1) + 5·a

    The function is simplified by expanding the product of sums into sums of products, as follows;

    a·(a² – a + 1) + 5·a = a × a² – a × a + a × 1 + 5·a = a³ – a² + a + 5·a = a³ – a² + 6·a

    The function, a·(a² – a + 1) + 5·a, in simplified format is therefore;

    a·(a² – a + 1) + 5·a = a³ – a² + 6·a

    Part B

    When a = -2, we get;

    (a³ – a² + 6·a)_{a = 2} = (-2)³ – (-2)² + 6·(-2) = -8 – 4 – 12 = -24

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