x^2=-8x-40

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Solution for x^2=-8x-40 equation:


Simplifying
x2 = -8x + -40

Reorder the terms:
x2 = -40 + -8x

Solving
x2 = -40 + -8x

Solving for variable 'x'.

Reorder the terms:
40 + 8x + x2 = -40 + -8x + 40 + 8x

Reorder the terms:
40 + 8x + x2 = -40 + 40 + -8x + 8x

Combine like terms: -40 + 40 = 0
40 + 8x + x2 = 0 + -8x + 8x
40 + 8x + x2 = -8x + 8x

Combine like terms: -8x + 8x = 0
40 + 8x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-40' to each side of the equation.
40 + 8x + -40 + x2 = 0 + -40

Reorder the terms:
40 + -40 + 8x + x2 = 0 + -40

Combine like terms: 40 + -40 = 0
0 + 8x + x2 = 0 + -40
8x + x2 = 0 + -40

Combine like terms: 0 + -40 = -40
8x + x2 = -40

The x term is 8x.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8x + 16 + x2 = -40 + 16

Reorder the terms:
16 + 8x + x2 = -40 + 16

Combine like terms: -40 + 16 = -24
16 + 8x + x2 = -24

Factor a perfect square on the left side:
(x + 4)(x + 4) = -24

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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