Homework Help: algebra 2

Posted by kay on Wednesday, January 18, 2012 at 5:45pm.

How do you find the discriminant of 3x2+2x-7 and what does it tell you about the equation?

algebra 2 - Reiny, Wednesday, January 18, 2012 at 5:55pm
for 3x^2 + 2x - 7 = 0

discr = 4 -4(3)(-7) = +88

so you have real roots, both irrational
algebra 2 - Damon, Wednesday, January 18, 2012 at 5:56pm
b^2-4ac

2^2 -4(3)(-7)

4 + 84 = 88 = 8*11

It tells you that there are two real roots because the discriminant is positive and that the roots will not be whole numbers because there will be a square root of 11 involved.

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