h^2+3h-90=0

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Solution for h^2+3h-90=0 equation:


Simplifying
h2 + 3h + -90 = 0

Reorder the terms:
-90 + 3h + h2 = 0

Solving
-90 + 3h + h2 = 0

Solving for variable 'h'.

Begin completing the square.

Move the constant term to the right:

Add '90' to each side of the equation.
-90 + 3h + 90 + h2 = 0 + 90

Reorder the terms:
-90 + 90 + 3h + h2 = 0 + 90

Combine like terms: -90 + 90 = 0
0 + 3h + h2 = 0 + 90
3h + h2 = 0 + 90

Combine like terms: 0 + 90 = 90
3h + h2 = 90

The h term is 3h.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3h + 2.25 + h2 = 90 + 2.25

Reorder the terms:
2.25 + 3h + h2 = 90 + 2.25

Combine like terms: 90 + 2.25 = 92.25
2.25 + 3h + h2 = 92.25

Factor a perfect square on the left side:
(h + 1.5)(h + 1.5) = 92.25

Calculate the square root of the right side: 9.604686356

Break this problem into two subproblems by setting 
(h + 1.5) equal to 9.604686356 and -9.604686356.

Subproblem 1

h + 1.5 = 9.604686356 Simplifying h + 1.5 = 9.604686356 Reorder the terms: 1.5 + h = 9.604686356 Solving 1.5 + h = 9.604686356 Solving for variable 'h'. Move all terms containing h to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + h = 9.604686356 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + h = 9.604686356 + -1.5 h = 9.604686356 + -1.5 Combine like terms: 9.604686356 + -1.5 = 8.104686356 h = 8.104686356 Simplifying h = 8.104686356

Subproblem 2

h + 1.5 = -9.604686356 Simplifying h + 1.5 = -9.604686356 Reorder the terms: 1.5 + h = -9.604686356 Solving 1.5 + h = -9.604686356 Solving for variable 'h'. Move all terms containing h to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + h = -9.604686356 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + h = -9.604686356 + -1.5 h = -9.604686356 + -1.5 Combine like terms: -9.604686356 + -1.5 = -11.104686356 h = -11.104686356 Simplifying h = -11.104686356

Solution

The solution to the problem is based on the solutions from the subproblems. h = {8.104686356, -11.104686356}

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