Which of the following describes the parabola with the equation y = −x2 − 3x + 6? A) The axis of symmetry is x = 1.5 and the ve

Question

Which of the following describes the parabola with the equation y = −x2 − 3x + 6?

A) The axis of symmetry is x = 1.5 and the vertex is (1.5, 12.75).
B) The axis of symmetry is x = −1 and the vertex is (−1, −3).
C) The axis of symmetry is x = −1.5 and the vertex is (−1.5, 8.25).
D) The axis of symmetry is x = 0 and the vertex is (0, 6).

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Diễm Thu 4 years 2021-08-11T21:37:53+00:00 1 Answers 129 views 0

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  1. thachthao
    0
    2021-08-11T21:39:24+00:00
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    Answer:

    C) The axis of symmetry is x = −1.5 and the vertex is (−1.5, 8.25).

    Step-by-step explanation:

    The axis of symmetry is x = − b/2a

    = -(-3) / 2(-1)

    = 3/(-2)

    = -1.5

    the vertex => x = -1.5

    y= -(-1.5)²-3(-1.5)+6 =

    -2.25 +4.5+6= 8.25

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