h^2+2h-7=0

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Solution for h^2+2h-7=0 equation:


Simplifying
h2 + 2h + -7 = 0

Reorder the terms:
-7 + 2h + h2 = 0

Solving
-7 + 2h + h2 = 0

Solving for variable 'h'.

Begin completing the square.

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + 2h + 7 + h2 = 0 + 7

Reorder the terms:
-7 + 7 + 2h + h2 = 0 + 7

Combine like terms: -7 + 7 = 0
0 + 2h + h2 = 0 + 7
2h + h2 = 0 + 7

Combine like terms: 0 + 7 = 7
2h + h2 = 7

The h term is 2h.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2h + 1 + h2 = 7 + 1

Reorder the terms:
1 + 2h + h2 = 7 + 1

Combine like terms: 7 + 1 = 8
1 + 2h + h2 = 8

Factor a perfect square on the left side:
(h + 1)(h + 1) = 8

Calculate the square root of the right side: 2.828427125

Break this problem into two subproblems by setting 
(h + 1) equal to 2.828427125 and -2.828427125.

Subproblem 1

h + 1 = 2.828427125 Simplifying h + 1 = 2.828427125 Reorder the terms: 1 + h = 2.828427125 Solving 1 + h = 2.828427125 Solving for variable 'h'. Move all terms containing h to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + h = 2.828427125 + -1 Combine like terms: 1 + -1 = 0 0 + h = 2.828427125 + -1 h = 2.828427125 + -1 Combine like terms: 2.828427125 + -1 = 1.828427125 h = 1.828427125 Simplifying h = 1.828427125

Subproblem 2

h + 1 = -2.828427125 Simplifying h + 1 = -2.828427125 Reorder the terms: 1 + h = -2.828427125 Solving 1 + h = -2.828427125 Solving for variable 'h'. Move all terms containing h to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + h = -2.828427125 + -1 Combine like terms: 1 + -1 = 0 0 + h = -2.828427125 + -1 h = -2.828427125 + -1 Combine like terms: -2.828427125 + -1 = -3.828427125 h = -3.828427125 Simplifying h = -3.828427125

Solution

The solution to the problem is based on the solutions from the subproblems. h = {1.828427125, -3.828427125}

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