SOLUTION: the difference between the roots of x^2 - 7x - 9 = 0 is a) 7 b) 7/2 c) 9 d) 2 square root 85 e) square root 85

SOLUTION: the difference between the roots of x^2 - 7x - 9 = 0 is a) 7 b) 7/2 c) 9 d) 2 square root 85 e) square root 85

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Question 233404: the difference between the roots of x^2 - 7x - 9 = 0 is
a) 7 b) 7/2 c) 9 d) 2 square root 85 e) square root 85
Answer by jsmallt9(3758) (Show Source): You can put this solution on YOUR website!
For the roots are:

and

The difference would be:

These two fractions have the same denominator so we can go ahead and subtract. The -b's in the numerator cancel and we end up with:

The 2's cancel leaving:

Using this on your equation we get a difference of:

So (e) is the answer.
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