Jenniferp
Jenniferp Jenniferp
  • 01-05-2017
  • Mathematics
contestada

which of the following are solutions to 2x^2 -8x -90
A) 2
B) -5
C) -7
D) 9
E) 15
F) 5
G) 7

Respuesta :

altavistard
altavistard altavistard
  • 08-07-2018
Please equate 2x^2 -8x -90 to zero:    2x^2 -8x -90=0

Next, reduce 
2x^2 -8x -90=0 by div. all terms by 2:    x^2 -4x -45=0

Next, factor the poly:  (x-9)(x+5) = 0

Set each factor = to 0 and solve for x:

x-9=0 => x=9
x+5=0 => x= -5
Answer Link

Otras preguntas

how do u solve this problem? 4n+32=5n
Decibel levels over 100 can cause loss of hearing. True or False
What is the best example of a factor that indicates the success of a corporation?
Argumentative text on recognition of human rights as the basis of social coexistence
Please help with math question! This question is stressing me out (View Image)
how is science used by a firefighter
the greatest recorded depth of the Antarctic ice sheet was recorded at 15,400 feet. A mile is 5,380 feet. Estimate how many miles thick ice is. Then explain how
Which kind of sentence is this? We conducted a science experiment to study the surface tension of water. a. imperative b. interrogative c. exclamatory d. decla
Match these up 1. Human sewage 2. Limiting nutrient 3. Dead organisms and solid waste 4. Human activity 5. 80% of air a. can cause eutrophication b. n
In “The Jilting of Granny Weatherall,” what is odd about Granny wanting to spank Cornelia?