m5arasEvacut4Lekah m5arasEvacut4Lekah
  • 24-11-2016
  • Mathematics
contestada

Find the zeros of the function.

f(x) = 9x3 + 18 x2 - 135x

-5 and 3

5 and -3

0, 5, and -3

0, -5, and 3

Respuesta :

Nirina7
Nirina7 Nirina7
  • 25-11-2016
the answer is 
f(x) = 9x3 + 18 x2 - 135x can be written as f(x) = x( 9x2+ 18 x - 135)
the first zero must be = 0
let's find the another zeros by solving 9x2+ 18 x - 135=0
f(-5)=135-135=0, so the answer is 

0, -5, and 3 

because 
f(x) = 9x3 + 18 x2 - 135x =x (x+5)(x-3)
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