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

If a turtle is hit by a boat and damage is done to its shell, is the injury able to heal? Identify the correct answer to this quesiton and the correct names for

how many significant digits are in 80,000

Find 3 consecutive integers such that twice the first, plus three times the second, plus four times the third is 20. Please show work, explain throughly so I ca

The cell membrane of a red blood cell will allow water, oxygen, carbon dioxide, and glucose to pass through. Since other substances are blocked from coming in,

Which words in the sentence are the adverb clause? Although my grandmother works, she calls us every week to ask about our lives. A. she calls us B. every week

I need help on number 6)

need help on any number cause it is due tomorrow

Read the sentence. The flute is not as difficult to play as I once thought. Which rewritten sentence begins with an adverb? A. It’s not as difficult to play as

Find the best word to complete the sentence. 2. In recent years fear of skin cancer has increased, encouraging greater ___ from long hours in the sun. A. abstin

Britain saw its colonies as a source of