Homework Help

Find the x-intercepts by factoring. y = x^2 - 4x - 32

user profile pic

loishy | Student, Grade 10 | (Level 1) Salutatorian

Posted April 11, 2013 at 7:53 PM via web

dislike 2 like

Find the x-intercepts by factoring.

y = x^2 - 4x - 32

2 Answers | Add Yours

user profile pic

paduncan | High School Teacher | (Level 1) Adjunct Educator

Posted April 11, 2013 at 10:26 PM (Answer #1)

dislike 2 like

y = x^2 - 4x - 32

Factor

(x + 4) (x - 8) = y

y = 0

(x + 4) = 0

x = -4

x - 8 = 0

x = 8

answers: (-4, 0) (8, 0)

 

user profile pic

oldnick | (Level 1) Valedictorian

Posted April 12, 2013 at 12:15 AM (Answer #2)

dislike 0 like

`x^2 -4x-32= x^2 - 4x+4 -36`

so we have:  `(x-2)^2= 36`

thus:   `x-2 =` `+-` `6`

          `x= 2 +- 6`     `x = 8`   `x= -4`

Join to answer this question

Join a community of thousands of dedicated teachers and students.

Join eNotes