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{2x}^(2) + 2x + 6 = 0
equation with the variables​

User Amitmula
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1 Answer

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Solving Quadratic Equations by Completing the Square

Answer:


x = (i√(11) -1)/(2)\\ and
x = -(i√(11) +1)/(2)\\

Explanation:

Given:


2x^2 +2x +6 = 0

Solution:


2x^2 +2x +6 = 0 \\ 2x^2 +2x = -6 \\ x^2 + x = -3 \\ x^2 +x +(1)/(4) = -3 +(1)/(4) \\ (x +(1)/(2))^2 = -(12)/(4) +(1)/(4) \\ (x +(1)/(2))^2 = -(11)/(4) \\ x +(1)/(2) = ±\sqrt{-(11)/(4)} \\ x +(1)/(2) = ±(i√(11))/(2)

Solving for the positive square root:


x +(1)/(2) = (i√(11))/(2) \\ x = (i√(11))/(2) -(1)/(2) \\ x = (i√(11) -1)/(2)

Solving for the negative square root:


x +(1)/(2) = -(i√(11))/(2) \\ x = -(i√(11))/(2) -(1)/(2) \\ x = (-i√(11) -1)/(2) \\ x = -(i√(11) +1)/(2)

User Trumank
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