Answer :

Given 21x2 – 28x + 10 = 0


Recall that the roots of quadratic equation ax2 + bx + c = 0, where a ≠ 0, are given by



Here, a = 21, b = –28 and c = 10






We have i2 = –1


By substituting –1 = i2 in the above equation, we get









Thus, the roots of the given equation are.


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