Find the x-intercepts for the parabola defined by the equation below.

y = 2x2 + 2x - 4
A) (-4, 0) and (2, 0)
B) (-2, 0) and (1, 0)
C) (0, -2) and (0, 1)
D) (0, -4) and (0, 2)

Question

Find the x-intercepts for the parabola defined by the equation below.

y = 2x2 + 2x - 4
A) (-4, 0) and (2, 0)
B) (-2, 0) and (1, 0)
C) (0, -2) and (0, 1)
D) (0, -4) and (0, 2)

mathmale · Answer

This question could be re-written in several equivalent forms:  "Find the roots of y=2x^2+2x-4," or "solve y-2x^2+2x-4=0."

Supposing the problem statement were the latter.  What would you do to find these solutions?  Think:  "quadratic equation."  Consider:  quadratic formula, factoring, graphing, and so on.

anonymous · Answer

@mathmale steps?
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