(-z^2-5z+1)+(-4z^2+3z+1)=

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Solution for (-z^2-5z+1)+(-4z^2+3z+1)= equation:


Simplifying
(-1z2 + -5z + 1) + (-4z2 + 3z + 1) = 0

Reorder the terms:
(1 + -5z + -1z2) + (-4z2 + 3z + 1) = 0

Remove parenthesis around (1 + -5z + -1z2)
1 + -5z + -1z2 + (-4z2 + 3z + 1) = 0

Reorder the terms:
1 + -5z + -1z2 + (1 + 3z + -4z2) = 0

Remove parenthesis around (1 + 3z + -4z2)
1 + -5z + -1z2 + 1 + 3z + -4z2 = 0

Reorder the terms:
1 + 1 + -5z + 3z + -1z2 + -4z2 = 0

Combine like terms: 1 + 1 = 2
2 + -5z + 3z + -1z2 + -4z2 = 0

Combine like terms: -5z + 3z = -2z
2 + -2z + -1z2 + -4z2 = 0

Combine like terms: -1z2 + -4z2 = -5z2
2 + -2z + -5z2 = 0

Solving
2 + -2z + -5z2 = 0

Solving for variable 'z'.

Begin completing the square.  Divide all terms by
-5 the coefficient of the squared term: 

Divide each side by '-5'.
-0.4 + 0.4z + z2 = 0

Move the constant term to the right:

Add '0.4' to each side of the equation.
-0.4 + 0.4z + 0.4 + z2 = 0 + 0.4

Reorder the terms:
-0.4 + 0.4 + 0.4z + z2 = 0 + 0.4

Combine like terms: -0.4 + 0.4 = 0.0
0.0 + 0.4z + z2 = 0 + 0.4
0.4z + z2 = 0 + 0.4

Combine like terms: 0 + 0.4 = 0.4
0.4z + z2 = 0.4

The z term is 0.4z.  Take half its coefficient (0.2).
Square it (0.04) and add it to both sides.

Add '0.04' to each side of the equation.
0.4z + 0.04 + z2 = 0.4 + 0.04

Reorder the terms:
0.04 + 0.4z + z2 = 0.4 + 0.04

Combine like terms: 0.4 + 0.04 = 0.44
0.04 + 0.4z + z2 = 0.44

Factor a perfect square on the left side:
(z + 0.2)(z + 0.2) = 0.44

Calculate the square root of the right side: 0.663324958

Break this problem into two subproblems by setting 
(z + 0.2) equal to 0.663324958 and -0.663324958.

Subproblem 1

z + 0.2 = 0.663324958 Simplifying z + 0.2 = 0.663324958 Reorder the terms: 0.2 + z = 0.663324958 Solving 0.2 + z = 0.663324958 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-0.2' to each side of the equation. 0.2 + -0.2 + z = 0.663324958 + -0.2 Combine like terms: 0.2 + -0.2 = 0.0 0.0 + z = 0.663324958 + -0.2 z = 0.663324958 + -0.2 Combine like terms: 0.663324958 + -0.2 = 0.463324958 z = 0.463324958 Simplifying z = 0.463324958

Subproblem 2

z + 0.2 = -0.663324958 Simplifying z + 0.2 = -0.663324958 Reorder the terms: 0.2 + z = -0.663324958 Solving 0.2 + z = -0.663324958 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-0.2' to each side of the equation. 0.2 + -0.2 + z = -0.663324958 + -0.2 Combine like terms: 0.2 + -0.2 = 0.0 0.0 + z = -0.663324958 + -0.2 z = -0.663324958 + -0.2 Combine like terms: -0.663324958 + -0.2 = -0.863324958 z = -0.863324958 Simplifying z = -0.863324958

Solution

The solution to the problem is based on the solutions from the subproblems. z = {0.463324958, -0.863324958}

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