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