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It has two equal roots which are 3
In standard arithmetic, the only square roots of 9 are: 3 and -3 Proof: 3 x 3 = 9 -3 x -3 = 9
They are -3 and +3.
A quadratic equation has two roots. They may be similar or dissimilar. As the highest power of a quadratic equation is 2 , there are 2 roots. Similarly, in the cubic equation, the highest power is 3, so it has three equal or unequal roots. So the highest power of an equation is the answer to the no of roots of that particular equation.