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02-09-2016
Mathematics

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Find the x-intercepts for the parabola defined by the equation below. y = 2x2 + 2x - 4

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HomertheGenius HomertheGenius

02-09-2016

2 x² + 2 x - 4 = 0
2 x² + 4 x - 2 x - 4 = 0
2 x ( x + 2 ) - 2 ( x + 2 ) = 0
( x + 2 ) ( 2 x - 2 ) 0 0
x + 2 = 0, or : 2 x - 2 = 0
x = - 2, 2 x = 2, x = 1
The x-intercepts are: ( -2, 0 ) and ( 1, 0 ).

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