x^2+8x+16=-1

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Solution for x^2+8x+16=-1 equation:


Simplifying
x2 + 8x + 16 = -1

Reorder the terms:
16 + 8x + x2 = -1

Solving
16 + 8x + x2 = -1

Solving for variable 'x'.

Reorder the terms:
16 + 1 + 8x + x2 = -1 + 1

Combine like terms: 16 + 1 = 17
17 + 8x + x2 = -1 + 1

Combine like terms: -1 + 1 = 0
17 + 8x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-17' to each side of the equation.
17 + 8x + -17 + x2 = 0 + -17

Reorder the terms:
17 + -17 + 8x + x2 = 0 + -17

Combine like terms: 17 + -17 = 0
0 + 8x + x2 = 0 + -17
8x + x2 = 0 + -17

Combine like terms: 0 + -17 = -17
8x + x2 = -17

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 = -17 + 16

Reorder the terms:
16 + 8x + x2 = -17 + 16

Combine like terms: -17 + 16 = -1
16 + 8x + x2 = -1

Factor a perfect square on the left side:
(x + 4)(x + 4) = -1

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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