z=ln(x^2+y^2+4*x-2*y+1)

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Solution for z=ln(x^2+y^2+4*x-2*y+1) equation: 


Simplifying
z = ln(x2 + y2 + 4x + -2y + 1)

Reorder the terms:
z = ln(1 + 4x + x2 + -2y + y2)
z = (1 * ln + 4x * ln + x2 * ln + -2y * ln + y2 * ln)
z = (1ln + 4lnx + lnx2 + -2lny + lny2)

Solving
z = 1ln + 4lnx + lnx2 + -2lny + lny2

Solving for variable 'z'.

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

Simplifying
z = 1ln + 4lnx + lnx2 + -2lny + lny2

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