Majd A.

asked • 01/06/20

# 4 straight lines cross the origin in a coordinate plane, and all of them intersect a parabola whose equation is y = x^2 - 2 in 8 points.

4 straight lines cross the origin in a coordinate plane, and all of them intersect a parabola whose equation is

y = x2 - 2 in 8 points. What is the product of multiplying the x-coordinates of these 8 points?

a) only 16

b) only -16

c) only 8

d) only -8

e) there are multiple possible values

I know the answer is 16, and I can multiply possible values to get it, but why do we get 16 exactly? I suppose it has to do with the parabola properties, but I am not sure

## 2 Answers By Expert Tutors

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Arthur D. answered • 01/06/20

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Effective Mathematics Tutor

Mark M. answered • 01/06/20

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5.0 (243)

Mathematics Teacher - NCLB Highly Qualified

Majd A.

Really helps. Thanks!
Report

01/07/20

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