jkim1118 wrote:

Which of the following functions does not intersect with y = 3x^2 + 2x + 1

A. y = 3x^2 + 3x + 1

B. y = 2x^2 + 3x + 1

C. y = 3x^2 + 2x + 3

D. y = 4x^2 + 2x - 3

E. y = x^2 + 2x + 3

This question is not from the

OG, but I am stuck on this question. Can anyone help me?

If you are familiar with graphs, this question gets solved within a minute as shown by Bunuel... but I am not that comfortable with graphs...

I solved it by equating the the equation given in the question stem to the equation given in the answer choices...

A. y = 3x^2 + 3x + 1 = 3x^2 + 2x + 1.. this gives x=0 thus these two sets of equations intersect at x=0 and y=1

B. y = 2x^2 + 3x + 1 = 3x^2 + 2x + 1... this gives x^2 -x = 0 which means either x=0 or x=1. Thus these two intersect at 2 points.

C. y = 3x^2 + 2x + 3 = 3x^2 + 2x + 1.. this does not give a solution... thus the answer is C

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