Which of the following numbers must be added to complete the square in the equation below?

x²+18x= -27

a. 18 b. 9 c. 54 d. 81

a complex number is a number that can be expressed in the form a + bi, where a and b are real numbers, and i is a solution of the equation x2 = −1. because no real number satisfies this equation, i is called an imaginary number. has no real solution, since the square of a real number cannot be negative.

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