The parabola described by y = x2 - 4x - 21 has x-intercepts at (-3,0) and (7,0). What is the vertex of this parabola?
(4, -21)
(2,-21)
(-4,9)
(2, 25)
(1,-24)
(2,-25)
(0,-24)

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Ответ:

jakeagilbert

13.07.2022

Mathematics

-3.6

Step-by-step explanation:

z/(-2) + -5 = -3.2 → times -2

z + 10 = 6.4

z = 6.4 - 10

z = -3.6

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The parabola described by y = x2 - 4x - 21 has x-intercepts at (-3,0) and (7,0). What is the vertex of this parabola? (4, -21) (2,-21) (-4,9) (2, 25) (1,-24) (2,-25) (0,-24)