Which of the following expressions is equal to 3x^2+27

The roots of the the given equation are +3i or -3i.

Solution:

Given,

First of all compare the given equation with the standard form, i.e

On comparing,  

a=3

b=0

c=27

According to the quadratic formula,

As comes out to be negative, the given equation does not have any real roots,

Root of 324 is 18,

(Because root of -1 is i)

On dividing 18 and 6 we get,

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