Posted by kay on Wednesday, January 18, 2012 at 5:45pm.
How do you find the discriminant of 3x2+2x7 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^24ac
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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