josephmontante1 josephmontante1
  • 02-02-2018
  • Mathematics
contestada

why is parentheses x + 9 parentheses x - 9 parentheses not equivalent to 2 x ^ 2 - 18

Respuesta :

AnimeBrainly
AnimeBrainly AnimeBrainly
  • 02-02-2018
(x + 9) (x - 9)

follow the FOIL method

first

x(x) = x^2

outside 
x(-9) = -9x

inside
9(x) = 9x

last 
9(-9) = -81

 x² - 9x + 9x - 81
simplify: x² - 81

x² - 81 is your answer

hope this helps

it is not - 18, because you are multiplying, not adding, and even if you are adding, the answer wouldn't have a -18

hope this helps
Answer Link

Otras preguntas

Leaders can make decisions without consulting others unless:
A vector quantity has _____. A) magnitude only B) direction only C) both magnitude and direction
Which of the following is the most accurate statement about United States involvement in world War 1. A. The United States stayed out of the war for more than t
0.140625 as a fraction
Use the correct form of the verb ser or estar: Yo __________ emocionada. When entering your answers for fill in the blank and essay questions, please be sure
The creation of guilds,feudalism, and the manorial system are most likely associated with which historical period
one of the elements of style is the way the author uses language by manipulate the word order and sentence structure. this stylistic device is called
Find simple interest for 640$, 3%, 2 years
What is 458 divided by 5
4+2×5= How do I solve this problem