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By solving for its discriminant((b)²-4ac)
if discriminant
= 0 then nature is real and equal
= a perfect square then the nature is rational and not equal
= not a perfect square then the nature is irrational and not equal
= a negative number then the nature is not a real number
0 0 0
The formula is: (sing it to the tune of london brigde is falling down so you will not forget it :) )
x= \frac{-b+- \sqrt{b x^{2} -4ac}  }{2a}
0 0 0
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