(h+8)(h+2)=100

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Solution for (h+8)(h+2)=100 equation:


Simplifying
(h + 8)(h + 2) = 100

Reorder the terms:
(8 + h)(h + 2) = 100

Reorder the terms:
(8 + h)(2 + h) = 100

Multiply (8 + h) * (2 + h)
(8(2 + h) + h(2 + h)) = 100
((2 * 8 + h * 8) + h(2 + h)) = 100
((16 + 8h) + h(2 + h)) = 100
(16 + 8h + (2 * h + h * h)) = 100
(16 + 8h + (2h + h2)) = 100

Combine like terms: 8h + 2h = 10h
(16 + 10h + h2) = 100

Solving
16 + 10h + h2 = 100

Solving for variable 'h'.

Reorder the terms:
16 + -100 + 10h + h2 = 100 + -100

Combine like terms: 16 + -100 = -84
-84 + 10h + h2 = 100 + -100

Combine like terms: 100 + -100 = 0
-84 + 10h + h2 = 0

Begin completing the square.

Move the constant term to the right:

Add '84' to each side of the equation.
-84 + 10h + 84 + h2 = 0 + 84

Reorder the terms:
-84 + 84 + 10h + h2 = 0 + 84

Combine like terms: -84 + 84 = 0
0 + 10h + h2 = 0 + 84
10h + h2 = 0 + 84

Combine like terms: 0 + 84 = 84
10h + h2 = 84

The h term is 10h.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10h + 25 + h2 = 84 + 25

Reorder the terms:
25 + 10h + h2 = 84 + 25

Combine like terms: 84 + 25 = 109
25 + 10h + h2 = 109

Factor a perfect square on the left side:
(h + 5)(h + 5) = 109

Calculate the square root of the right side: 10.440306509

Break this problem into two subproblems by setting 
(h + 5) equal to 10.440306509 and -10.440306509.

Subproblem 1

h + 5 = 10.440306509 Simplifying h + 5 = 10.440306509 Reorder the terms: 5 + h = 10.440306509 Solving 5 + h = 10.440306509 Solving for variable 'h'. Move all terms containing h to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + h = 10.440306509 + -5 Combine like terms: 5 + -5 = 0 0 + h = 10.440306509 + -5 h = 10.440306509 + -5 Combine like terms: 10.440306509 + -5 = 5.440306509 h = 5.440306509 Simplifying h = 5.440306509

Subproblem 2

h + 5 = -10.440306509 Simplifying h + 5 = -10.440306509 Reorder the terms: 5 + h = -10.440306509 Solving 5 + h = -10.440306509 Solving for variable 'h'. Move all terms containing h to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + h = -10.440306509 + -5 Combine like terms: 5 + -5 = 0 0 + h = -10.440306509 + -5 h = -10.440306509 + -5 Combine like terms: -10.440306509 + -5 = -15.440306509 h = -15.440306509 Simplifying h = -15.440306509

Solution

The solution to the problem is based on the solutions from the subproblems. h = {5.440306509, -15.440306509}

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