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What are the zero(s) of the function f(x)=
(4x^(2)-36x )/(x-9)?

a.) x = -9
b.)x = 0
c.)x = 9
d.)x = 0 and x = 9

User DJ House
by
7.9k points

1 Answer

1 vote

Answer:

D

Explanation:

The function will be zero when the numerator is equal to 0. So, set the numerator equal to 0 and solve:


0 = 4 {x}^(2) - 36x

I will use the quadratic formula:


\frac{ 36 + \sqrt{ {36}^(2) - 4(4)(0)} }{2(4)} \\ ( 36 + 36)/(8) = 9

Therefore, x = 9 is a 0. Let's check with subtracted root now:


\frac{ 36 - \sqrt{ {36}^(2) - 4(4)(0)} }{2(4)} \\ ( 36 - 36)/(8) = 0

It appears 0 is also a root.

Therefore, the answer is D.

User Wthamira
by
7.7k points

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