8z-3(5z^2-3)-(4z^2+z-5)=

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Solution for 8z-3(5z^2-3)-(4z^2+z-5)= equation:


Simplifying
8z + -3(5z2 + -3) + -1(4z2 + z + -5) = 0

Reorder the terms:
8z + -3(-3 + 5z2) + -1(4z2 + z + -5) = 0
8z + (-3 * -3 + 5z2 * -3) + -1(4z2 + z + -5) = 0
8z + (9 + -15z2) + -1(4z2 + z + -5) = 0

Reorder the terms:
8z + 9 + -15z2 + -1(-5 + z + 4z2) = 0
8z + 9 + -15z2 + (-5 * -1 + z * -1 + 4z2 * -1) = 0
8z + 9 + -15z2 + (5 + -1z + -4z2) = 0

Reorder the terms:
9 + 5 + 8z + -1z + -15z2 + -4z2 = 0

Combine like terms: 9 + 5 = 14
14 + 8z + -1z + -15z2 + -4z2 = 0

Combine like terms: 8z + -1z = 7z
14 + 7z + -15z2 + -4z2 = 0

Combine like terms: -15z2 + -4z2 = -19z2
14 + 7z + -19z2 = 0

Solving
14 + 7z + -19z2 = 0

Solving for variable 'z'.

Begin completing the square.  Divide all terms by
-19 the coefficient of the squared term: 

Divide each side by '-19'.
-0.7368421053 + -0.3684210526z + z2 = 0

Move the constant term to the right:

Add '0.7368421053' to each side of the equation.
-0.7368421053 + -0.3684210526z + 0.7368421053 + z2 = 0 + 0.7368421053

Reorder the terms:
-0.7368421053 + 0.7368421053 + -0.3684210526z + z2 = 0 + 0.7368421053

Combine like terms: -0.7368421053 + 0.7368421053 = 0.0000000000
0.0000000000 + -0.3684210526z + z2 = 0 + 0.7368421053
-0.3684210526z + z2 = 0 + 0.7368421053

Combine like terms: 0 + 0.7368421053 = 0.7368421053
-0.3684210526z + z2 = 0.7368421053

The z term is -0.3684210526z.  Take half its coefficient (-0.1842105263).
Square it (0.03393351800) and add it to both sides.

Add '0.03393351800' to each side of the equation.
-0.3684210526z + 0.03393351800 + z2 = 0.7368421053 + 0.03393351800

Reorder the terms:
0.03393351800 + -0.3684210526z + z2 = 0.7368421053 + 0.03393351800

Combine like terms: 0.7368421053 + 0.03393351800 = 0.7707756233
0.03393351800 + -0.3684210526z + z2 = 0.7707756233

Factor a perfect square on the left side:
(z + -0.1842105263)(z + -0.1842105263) = 0.7707756233

Calculate the square root of the right side: 0.87793828

Break this problem into two subproblems by setting 
(z + -0.1842105263) equal to 0.87793828 and -0.87793828.

Subproblem 1

z + -0.1842105263 = 0.87793828 Simplifying z + -0.1842105263 = 0.87793828 Reorder the terms: -0.1842105263 + z = 0.87793828 Solving -0.1842105263 + z = 0.87793828 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '0.1842105263' to each side of the equation. -0.1842105263 + 0.1842105263 + z = 0.87793828 + 0.1842105263 Combine like terms: -0.1842105263 + 0.1842105263 = 0.0000000000 0.0000000000 + z = 0.87793828 + 0.1842105263 z = 0.87793828 + 0.1842105263 Combine like terms: 0.87793828 + 0.1842105263 = 1.0621488063 z = 1.0621488063 Simplifying z = 1.0621488063

Subproblem 2

z + -0.1842105263 = -0.87793828 Simplifying z + -0.1842105263 = -0.87793828 Reorder the terms: -0.1842105263 + z = -0.87793828 Solving -0.1842105263 + z = -0.87793828 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '0.1842105263' to each side of the equation. -0.1842105263 + 0.1842105263 + z = -0.87793828 + 0.1842105263 Combine like terms: -0.1842105263 + 0.1842105263 = 0.0000000000 0.0000000000 + z = -0.87793828 + 0.1842105263 z = -0.87793828 + 0.1842105263 Combine like terms: -0.87793828 + 0.1842105263 = -0.6937277537 z = -0.6937277537 Simplifying z = -0.6937277537

Solution

The solution to the problem is based on the solutions from the subproblems. z = {1.0621488063, -0.6937277537}

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