2H^2-20=H+4*H-4

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Solution for 2H^2-20=H+4*H-4 equation:


Simplifying
2H2 + -20 = H + 4H + -4

Reorder the terms:
-20 + 2H2 = H + 4H + -4

Reorder the terms:
-20 + 2H2 = -4 + H + 4H

Combine like terms: H + 4H = 5H
-20 + 2H2 = -4 + 5H

Solving
-20 + 2H2 = -4 + 5H

Solving for variable 'H'.

Reorder the terms:
-20 + 4 + -5H + 2H2 = -4 + 5H + 4 + -5H

Combine like terms: -20 + 4 = -16
-16 + -5H + 2H2 = -4 + 5H + 4 + -5H

Reorder the terms:
-16 + -5H + 2H2 = -4 + 4 + 5H + -5H

Combine like terms: -4 + 4 = 0
-16 + -5H + 2H2 = 0 + 5H + -5H
-16 + -5H + 2H2 = 5H + -5H

Combine like terms: 5H + -5H = 0
-16 + -5H + 2H2 = 0

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

Divide each side by '2'.
-8 + -2.5H + H2 = 0

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + -2.5H + 8 + H2 = 0 + 8

Reorder the terms:
-8 + 8 + -2.5H + H2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + -2.5H + H2 = 0 + 8
-2.5H + H2 = 0 + 8

Combine like terms: 0 + 8 = 8
-2.5H + H2 = 8

The H term is -2.5H.  Take half its coefficient (-1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
-2.5H + 1.5625 + H2 = 8 + 1.5625

Reorder the terms:
1.5625 + -2.5H + H2 = 8 + 1.5625

Combine like terms: 8 + 1.5625 = 9.5625
1.5625 + -2.5H + H2 = 9.5625

Factor a perfect square on the left side:
(H + -1.25)(H + -1.25) = 9.5625

Calculate the square root of the right side: 3.092329219

Break this problem into two subproblems by setting 
(H + -1.25) equal to 3.092329219 and -3.092329219.

Subproblem 1

H + -1.25 = 3.092329219 Simplifying H + -1.25 = 3.092329219 Reorder the terms: -1.25 + H = 3.092329219 Solving -1.25 + H = 3.092329219 Solving for variable 'H'. Move all terms containing H to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + H = 3.092329219 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + H = 3.092329219 + 1.25 H = 3.092329219 + 1.25 Combine like terms: 3.092329219 + 1.25 = 4.342329219 H = 4.342329219 Simplifying H = 4.342329219

Subproblem 2

H + -1.25 = -3.092329219 Simplifying H + -1.25 = -3.092329219 Reorder the terms: -1.25 + H = -3.092329219 Solving -1.25 + H = -3.092329219 Solving for variable 'H'. Move all terms containing H to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + H = -3.092329219 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + H = -3.092329219 + 1.25 H = -3.092329219 + 1.25 Combine like terms: -3.092329219 + 1.25 = -1.842329219 H = -1.842329219 Simplifying H = -1.842329219

Solution

The solution to the problem is based on the solutions from the subproblems. H = {4.342329219, -1.842329219}

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