d^4+4d^2+16=0

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Solution for d^4+4d^2+16=0 equation:


Simplifying
d4 + 4d2 + 16 = 0

Reorder the terms:
16 + 4d2 + d4 = 0

Solving
16 + 4d2 + d4 = 0

Solving for variable 'd'.

Begin completing the square.

Move the constant term to the right:

Add '-16' to each side of the equation.
16 + 4d2 + -16 + d4 = 0 + -16

Reorder the terms:
16 + -16 + 4d2 + d4 = 0 + -16

Combine like terms: 16 + -16 = 0
0 + 4d2 + d4 = 0 + -16
4d2 + d4 = 0 + -16

Combine like terms: 0 + -16 = -16
4d2 + d4 = -16

The d term is 4d2.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4d2 + 4 + d4 = -16 + 4

Reorder the terms:
4 + 4d2 + d4 = -16 + 4

Combine like terms: -16 + 4 = -12
4 + 4d2 + d4 = -12

Factor a perfect square on the left side:
(d2 + 2)(d2 + 2) = -12

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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