u^4-2u^2-8=(u^2-4)(u^2+2)

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Solution for u^4-2u^2-8=(u^2-4)(u^2+2) equation:


Simplifying
u4 + -2u2 + -8 = (u2 + -4)(u2 + 2)

Reorder the terms:
-8 + -2u2 + u4 = (u2 + -4)(u2 + 2)

Reorder the terms:
-8 + -2u2 + u4 = (-4 + u2)(u2 + 2)

Reorder the terms:
-8 + -2u2 + u4 = (-4 + u2)(2 + u2)

Multiply (-4 + u2) * (2 + u2)
-8 + -2u2 + u4 = (-4(2 + u2) + u2(2 + u2))
-8 + -2u2 + u4 = ((2 * -4 + u2 * -4) + u2(2 + u2))
-8 + -2u2 + u4 = ((-8 + -4u2) + u2(2 + u2))
-8 + -2u2 + u4 = (-8 + -4u2 + (2 * u2 + u2 * u2))
-8 + -2u2 + u4 = (-8 + -4u2 + (2u2 + u4))

Combine like terms: -4u2 + 2u2 = -2u2
-8 + -2u2 + u4 = (-8 + -2u2 + u4)

Add '8' to each side of the equation.
-8 + -2u2 + 8 + u4 = -8 + -2u2 + 8 + u4

Reorder the terms:
-8 + 8 + -2u2 + u4 = -8 + -2u2 + 8 + u4

Combine like terms: -8 + 8 = 0
0 + -2u2 + u4 = -8 + -2u2 + 8 + u4
-2u2 + u4 = -8 + -2u2 + 8 + u4

Reorder the terms:
-2u2 + u4 = -8 + 8 + -2u2 + u4

Combine like terms: -8 + 8 = 0
-2u2 + u4 = 0 + -2u2 + u4
-2u2 + u4 = -2u2 + u4

Add '2u2' to each side of the equation.
-2u2 + 2u2 + u4 = -2u2 + 2u2 + u4

Combine like terms: -2u2 + 2u2 = 0
0 + u4 = -2u2 + 2u2 + u4
u4 = -2u2 + 2u2 + u4

Combine like terms: -2u2 + 2u2 = 0
u4 = 0 + u4
u4 = u4

Add '-1u4' to each side of the equation.
u4 + -1u4 = u4 + -1u4

Combine like terms: u4 + -1u4 = 0
0 = u4 + -1u4

Combine like terms: u4 + -1u4 = 0
0 = 0

Solving
0 = 0

Couldn't find a variable to solve for.

This equation is an identity, all real numbers are solutions.

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