SOLUTION: i need help using the discriminant to find the number of unique real solutions of 3x^2+3x=21 Thanks.

SOLUTION: i need help using the discriminant to find the number of unique real solutions of 3x^2+3x=21 Thanks.

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Question 1104098: i need help using the discriminant to find the number of unique real solutions of 3x^2+3x=21
Thanks.
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!

Discriminant is .

SIGN of Discriminant   SOLUTIONS
Negative                 0
Zero                     1
Positive                 2

-

Make the substitutions, evaluate, and decide.
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