Answer :

For a quadratic equation, ax2 + bx + c = 0,


D = b2 – 4ac


If D ≥ 0, roots are real



4b2 – 4ac ≥ 0


b2 ≥ ac ------ (1)



4ac – 4b2 ≥ 0


b2 ≤ ac ----- (2)


For both (1) and (2) to be true


b2 = ac


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