Find the x-intercepts.y=x²-4x-4?

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2007-05-21 03:06:10 · 3 answers · asked by Dave 4 in Science & Mathematics ➔ Mathematics

x² - 4x - 4 = 0
x = [4 ± √20] / 2
x = [4 ± 2√5 ] / 2
x = 2 ± √5 are intercepts.

2007-05-21 07:04:17 · answer #1 · answered by Como 7 · 0⤊ 0⤋

Intercepts x axis when y = 0

So...

0 = x^2 - 4x - 4

x = 4.8284...

x = -0.8284...

2007-05-21 10:14:20 · answer #2 · answered by Anonymous · 0⤊ 0⤋

quadratic formula

solve for x when y = 0

x-intercept are
when x=-2*(sqrt(2)-1) or
when x=2*(sqrt(2)+1)

2007-05-21 10:17:25 · answer #3 · answered by wilmer 5 · 0⤊ 0⤋