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

A synonym is a word that's A. similar in meaning. B. defined in a thesaurus. C. opposite in meaning. D. pronounced the same.

30-[(9x2)-(3x4)] numerical expression ;)

M.s. alonso ordered 4,000 markers for her store. Only 1/10 of them arrived. How many markers did she receive?

what is the quotient of 43.8 and 12

Cheese sticks that were previously priced at 5 for $1 are now four for $1 find the percent decrease in the number of cheese sticks you can buy for $1

What is 3 square root -27/64

how can the distributive property be used to find 4 x 875? draw an array.

One coin is randomly selected from a jar containing 20 pennies, 15 nickels, 3 dimes, and 12 quarters. What is the odds of a value less than $0.05

Which of the following climates is most suited for physical weathering? A. Hot B. Cool C. Warm D. Dry

Hannah buys 3 packs of 36 exposure films and 2 packages of 24 exposure films. She uses 8 rolls of film. How many rolls does she have left?