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

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

Containment was a policy in which the U.S. tried to do what?

Among other things, the romantics valued: a. individualism, the belief in the uniqueness of each person. b. socialism, a system in which society owns and contr

If -2(3y+5)=-4, find the value of 5y

what is 69/25 as a terminating decimal

Who was Malinche and what other name was she called?

What is an equivalent fraction for 20/12

An aircraft has a liftoff speed of 33 m/s. what minimum constant acceleration does this require if the aircraft is to be airborne after a take-off run of 240m?

What conditions must be met in order for a reaction to be considered exothermic?

Among other things, the romantics valued: a. individualism, the belief in the uniqueness of each person. b. socialism, a system in which society owns and contr

Solve the equation x=x+3