h^2+4h-20=0

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Solution for h^2+4h-20=0 equation:


Simplifying
h2 + 4h + -20 = 0

Reorder the terms:
-20 + 4h + h2 = 0

Solving
-20 + 4h + h2 = 0

Solving for variable 'h'.

Begin completing the square.

Move the constant term to the right:

Add '20' to each side of the equation.
-20 + 4h + 20 + h2 = 0 + 20

Reorder the terms:
-20 + 20 + 4h + h2 = 0 + 20

Combine like terms: -20 + 20 = 0
0 + 4h + h2 = 0 + 20
4h + h2 = 0 + 20

Combine like terms: 0 + 20 = 20
4h + h2 = 20

The h term is 4h.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4h + 4 + h2 = 20 + 4

Reorder the terms:
4 + 4h + h2 = 20 + 4

Combine like terms: 20 + 4 = 24
4 + 4h + h2 = 24

Factor a perfect square on the left side:
(h + 2)(h + 2) = 24

Calculate the square root of the right side: 4.898979486

Break this problem into two subproblems by setting 
(h + 2) equal to 4.898979486 and -4.898979486.

Subproblem 1

h + 2 = 4.898979486 Simplifying h + 2 = 4.898979486 Reorder the terms: 2 + h = 4.898979486 Solving 2 + h = 4.898979486 Solving for variable 'h'. Move all terms containing h to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + h = 4.898979486 + -2 Combine like terms: 2 + -2 = 0 0 + h = 4.898979486 + -2 h = 4.898979486 + -2 Combine like terms: 4.898979486 + -2 = 2.898979486 h = 2.898979486 Simplifying h = 2.898979486

Subproblem 2

h + 2 = -4.898979486 Simplifying h + 2 = -4.898979486 Reorder the terms: 2 + h = -4.898979486 Solving 2 + h = -4.898979486 Solving for variable 'h'. Move all terms containing h to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + h = -4.898979486 + -2 Combine like terms: 2 + -2 = 0 0 + h = -4.898979486 + -2 h = -4.898979486 + -2 Combine like terms: -4.898979486 + -2 = -6.898979486 h = -6.898979486 Simplifying h = -6.898979486

Solution

The solution to the problem is based on the solutions from the subproblems. h = {2.898979486, -6.898979486}

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