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

cuántos delfines están en la foto?
You people in the Algebra 1 course for high school, Are you guys ready for the exams next week? I'm definitely not. Anyway, A ball is dropped from a certain hei
The types of clastic sedimentary rock are based on _____. clast size crystal size number of layers chemical composition Unlimited Attempts Remain
SOmeone plz write me a Script for my classss im dying
can anyone help me with this math problem please
Which of the following choices is true about ergogenic aids? A. They allow an athlete to exercise longer. B. They are illegal to use in competition. C. They are
A 2.0-kilogram ball is tossed straight up with a kinetic energy of 196 joules. How high does it go?
Describe the type of rock and it’s texture that would form from the melted meteorite and Earths rocks
I need help with these three problems.... please help me????
|y+4|<1 A. -5 B. -3 C. -4 D. 1>y>4