samama samama
  • 11-05-2017
  • Mathematics
contestada

I know the answer is C. but I need to know how to solve it!

I know the answer is C but I need to know how to solve it class=

Respuesta :

mreijepatmat
mreijepatmat mreijepatmat
  • 11-05-2017
yes you are right it's C)
Notice  that f(-2) = (-2)³ +2( - 2)² + 4(-2) + 8 =0
Then x³+2x²+4x+8 is divisible by (x+2)
Perform this division & you will get:

x³+2x²+4x+8 = (x+2)(x²+4)
 The root of (x+2) is the value that render it nil, that is x=-2
  The root of (x²+4) are imaginary (not real) because
  x²+4 =0 ==> x² = -4 & x=√-4 or x= 2i (nor real).
Hope you understood the reasoning



Answer Link

Otras preguntas

what might happen if a cell lost its ability to preform cellular respiration
3.25+(7.75+4.89) use the associative property to add
what are factors give an example
Plaster of Paris is often used to create casts of impressions today. True or False Help please :)
china is separated from India subcontinent by the Himalayan mountains found at
a fish swims at a speed of 12 mph. a boy swims at a speed of 4.4 ft per s. how much faster does the fish swim than the boy in yards per minute if 3ft=1yd and 52
A person who weighs 100 pounds on Earth weighs 16.6lbs on the moon. Which variable is the independent variable
how did Islamic geographers contribute to the developments cartography
The polynomial 6x2 + 37x – 60 represents an integer. Which expressions represent integer factors of 6x2 + 37x – 60 for all values of x? 3x – 4 and 2x + 15 3x +
what did articles 1 2 3 talk about in the constitution