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Mathematics, 17.04.2021 05:40 lee543

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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The parabola described by y = x2 - 4x - 21 has x-intercepts at (-3,0) and (7,0). What is the vertex...

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