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3 years ago

Which point is an x-intercept of the quadratic function

Mathematics

1 answer:

kumpel [21]3 years ago

7 0

Answer:

(–9,0)

Step-by-step explanation:

f(x) = (x – 8)(x + 9)

= x² + 9x -8x - 72

= x² + x - 72

x-intercept is a coordinate of x axis where a function cuts the x-axis. They are points where y=0 or f(x) = 0.

x² + x - 72 = (x – 8)(x + 9) = 0

∴ x – 8 = 0

x = 8

x + 9 = 0

x = -9

The required points are (8, 0) and (-9, 0).

From the choices given there is only one correct answer. (–9,0)

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