Homework Help: Discrete Math

Posted by Bobbi on Tuesday, October 25, 2011 at 11:33am.

Prove that if a and b are integers with a not equal to zero and x is a real number such that ax^2-bx-b-a=0, then a | b. Note a | b means that a divides b.

Discrete Math - Steve, Tuesday, October 25, 2011 at 12:26pm
Is something wrong here?

3x^2 + 4x + 1 = 0
x = -1 or -1/3

a = 3, b = -4

a does not divide b

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