y=(x^2-4x-5)(x^2-16)

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Solution for y=(x^2-4x-5)(x^2-16) equation: 


Simplifying
y = (x2 + -4x + -5)(x2 + -16)

Reorder the terms:
y = (-5 + -4x + x2)(x2 + -16)

Reorder the terms:
y = (-5 + -4x + x2)(-16 + x2)

Multiply (-5 + -4x + x2) * (-16 + x2)
y = (-5(-16 + x2) + -4x * (-16 + x2) + x2(-16 + x2))
y = ((-16 * -5 + x2 * -5) + -4x * (-16 + x2) + x2(-16 + x2))
y = ((80 + -5x2) + -4x * (-16 + x2) + x2(-16 + x2))
y = (80 + -5x2 + (-16 * -4x + x2 * -4x) + x2(-16 + x2))
y = (80 + -5x2 + (64x + -4x3) + x2(-16 + x2))
y = (80 + -5x2 + 64x + -4x3 + (-16 * x2 + x2 * x2))
y = (80 + -5x2 + 64x + -4x3 + (-16x2 + x4))

Reorder the terms:
y = (80 + 64x + -5x2 + -16x2 + -4x3 + x4)

Combine like terms: -5x2 + -16x2 = -21x2
y = (80 + 64x + -21x2 + -4x3 + x4)

Solving
y = 80 + 64x + -21x2 + -4x3 + x4

Solving for variable 'y'.

Move all terms containing y to the left, all other terms to the right.

Simplifying
y = 80 + 64x + -21x2 + -4x3 + x4

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