Solve Using the Quadratic Formula x^2+6x+18=0

Problem

x2+6*x+18=0

Solution

1. Identify the coefficients a b and c from the quadratic equation in the form a*x2+b*x+c=0

a=1

b=6

c=18

2. State the quadratic formula used to solve for x

x=(−b±√(,b2−4*a*c))/(2*a)

3. Substitute the values of a b and c into the formula.

x=(−6±√(,6−4*(1)*(18)))/(2*(1))

4. Simplify the expression inside the square root, known as the discriminant.

x=(−6±√(,36−72))/2

x=(−6±√(,−36))/2

5. Apply the imaginary unit i because the discriminant is negative, where √(,−36)=6*i

x=(−6±6*i)/2

6. Divide each term in the numerator by the denominator to find the final complex solutions.

x=−3±3*i

Final Answer

x=−3±3*i

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