h^2+5h=225

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Solution for h^2+5h=225 equation:


Simplifying
h2 + 5h = 225

Reorder the terms:
5h + h2 = 225

Solving
5h + h2 = 225

Solving for variable 'h'.

Reorder the terms:
-225 + 5h + h2 = 225 + -225

Combine like terms: 225 + -225 = 0
-225 + 5h + h2 = 0

Begin completing the square.

Move the constant term to the right:

Add '225' to each side of the equation.
-225 + 5h + 225 + h2 = 0 + 225

Reorder the terms:
-225 + 225 + 5h + h2 = 0 + 225

Combine like terms: -225 + 225 = 0
0 + 5h + h2 = 0 + 225
5h + h2 = 0 + 225

Combine like terms: 0 + 225 = 225
5h + h2 = 225

The h term is 5h.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5h + 6.25 + h2 = 225 + 6.25

Reorder the terms:
6.25 + 5h + h2 = 225 + 6.25

Combine like terms: 225 + 6.25 = 231.25
6.25 + 5h + h2 = 231.25

Factor a perfect square on the left side:
(h + 2.5)(h + 2.5) = 231.25

Calculate the square root of the right side: 15.206906326

Break this problem into two subproblems by setting 
(h + 2.5) equal to 15.206906326 and -15.206906326.

Subproblem 1

h + 2.5 = 15.206906326 Simplifying h + 2.5 = 15.206906326 Reorder the terms: 2.5 + h = 15.206906326 Solving 2.5 + h = 15.206906326 Solving for variable 'h'. Move all terms containing h to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + h = 15.206906326 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + h = 15.206906326 + -2.5 h = 15.206906326 + -2.5 Combine like terms: 15.206906326 + -2.5 = 12.706906326 h = 12.706906326 Simplifying h = 12.706906326

Subproblem 2

h + 2.5 = -15.206906326 Simplifying h + 2.5 = -15.206906326 Reorder the terms: 2.5 + h = -15.206906326 Solving 2.5 + h = -15.206906326 Solving for variable 'h'. Move all terms containing h to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + h = -15.206906326 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + h = -15.206906326 + -2.5 h = -15.206906326 + -2.5 Combine like terms: -15.206906326 + -2.5 = -17.706906326 h = -17.706906326 Simplifying h = -17.706906326

Solution

The solution to the problem is based on the solutions from the subproblems. h = {12.706906326, -17.706906326}

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