x^2+20=-2x

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Solution for x^2+20=-2x equation:


Simplifying
x2 + 20 = -2x

Reorder the terms:
20 + x2 = -2x

Solving
20 + x2 = -2x

Solving for variable 'x'.

Reorder the terms:
20 + 2x + x2 = -2x + 2x

Combine like terms: -2x + 2x = 0
20 + 2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-20' to each side of the equation.
20 + 2x + -20 + x2 = 0 + -20

Reorder the terms:
20 + -20 + 2x + x2 = 0 + -20

Combine like terms: 20 + -20 = 0
0 + 2x + x2 = 0 + -20
2x + x2 = 0 + -20

Combine like terms: 0 + -20 = -20
2x + x2 = -20

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = -20 + 1

Reorder the terms:
1 + 2x + x2 = -20 + 1

Combine like terms: -20 + 1 = -19
1 + 2x + x2 = -19

Factor a perfect square on the left side:
(x + 1)(x + 1) = -19

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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