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Denisse Estrada
Mathematics
9 October, 11:06
How is X squared plus 4X - 8 equals zero
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Marcos Hanson
9 October, 11:17
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X^2 + 4x - 8 = 0
Move constant to right side.
x^2 + 4x = 8
Let's complete the square to find x.
(4/2) ^2 = 4
We add 4 to both sides.
x^2 + 4x + 4 = 8 + 4
Factor left side.
(x + 2) (x + 2) = 12
(x + 2) ^2 = 12
Take square root on both sides.
sqrt{ (x + 2) ^2} = sqrt{12}
x + 2 = 2•sqrt{3}
x + 2 = - 2•sqrt{3}
Two answers:
x = - 2 + 2•sqrt{3}
And
x = - 2 - 2•sqrt{3}
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