y^2+8y+400=0

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Solution for y^2+8y+400=0 equation:


Simplifying
y2 + 8y + 400 = 0

Reorder the terms:
400 + 8y + y2 = 0

Solving
400 + 8y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '-400' to each side of the equation.
400 + 8y + -400 + y2 = 0 + -400

Reorder the terms:
400 + -400 + 8y + y2 = 0 + -400

Combine like terms: 400 + -400 = 0
0 + 8y + y2 = 0 + -400
8y + y2 = 0 + -400

Combine like terms: 0 + -400 = -400
8y + y2 = -400

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

Add '16' to each side of the equation.
8y + 16 + y2 = -400 + 16

Reorder the terms:
16 + 8y + y2 = -400 + 16

Combine like terms: -400 + 16 = -384
16 + 8y + y2 = -384

Factor a perfect square on the left side:
(y + 4)(y + 4) = -384

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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