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Which is a zero of the quadratic function f(x) = 9x2 – 54x – 19? x = x = 3 x = 6 x = 9
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2 votes
Which is a zero of the quadratic function f(x) = 9x2 – 54x – 19?

x =
x = 3
x = 6
x = 9

User John Livermore
by
9.0k points

2 Answers

4 votes

Answer:

c

Explanation:

User Pelanes
by
9.1k points
1 vote
f(x) = 9x² - 54x - 19 = 9x² - 57x + 3x - 19 = 3x(3x - 19) + 1(3x - 19)

= (3x - 19)(3x + 1)

f(x) = 0 if 3x - 19 =0 or 3x + 1 = 0

3x = 19 or 3x = -1

x = 19/3 or x = -1/3
User Eefret
by
8.1k points
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