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January 29, 2015

January 29, 2015

Posted by **Anonymous** on Sunday, April 24, 2011 at 5:42am.

-15x² + 2x + 13 = 0

What is the value of the discriminant?

- JAD -
**drwls**, Sunday, April 24, 2011 at 7:47amUsing the conventional formula

ax^2 + bx + c for the quadratic polynomial, the discriminant is b^2 -4ac.

In this case, that equals 4 - (-780)= 784. The discriminant is positive. There are two roots and both are real. The square root of the discriminant is 28.

The roots are (-1/30)(-2 +/-28)

= 1 and -13/15

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