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zavuch27 [327]
3 years ago
6

A quadratic function f is defined by /«) = (x - 7)(x + 3).

Mathematics
1 answer:
lesya692 [45]3 years ago
6 0

Answer:

Step-by-step explanation:

The two x intercepts are

x -  7 = 0

x = 7

x + 3= 0

x = - 3

The y intercept is just - 7 * 3 = - 21

To prove this  more formally

f(x) = (x - 7)(x + 3)

f(x) = x^2 - 7x + 3x - 21

f(x) = x^2 - 4x - 21

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