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

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paduncan's profile pic

Posted on

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)

 

oldnick's profile pic

Posted on

`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`

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