x^2+15x-224=0

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Solution for x^2+15x-224=0 equation:


Simplifying
x2 + 15x + -224 = 0

Reorder the terms:
-224 + 15x + x2 = 0

Solving
-224 + 15x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '224' to each side of the equation.
-224 + 15x + 224 + x2 = 0 + 224

Reorder the terms:
-224 + 224 + 15x + x2 = 0 + 224

Combine like terms: -224 + 224 = 0
0 + 15x + x2 = 0 + 224
15x + x2 = 0 + 224

Combine like terms: 0 + 224 = 224
15x + x2 = 224

The x term is 15x.  Take half its coefficient (7.5).
Square it (56.25) and add it to both sides.

Add '56.25' to each side of the equation.
15x + 56.25 + x2 = 224 + 56.25

Reorder the terms:
56.25 + 15x + x2 = 224 + 56.25

Combine like terms: 224 + 56.25 = 280.25
56.25 + 15x + x2 = 280.25

Factor a perfect square on the left side:
(x + 7.5)(x + 7.5) = 280.25

Calculate the square root of the right side: 16.740669043

Break this problem into two subproblems by setting 
(x + 7.5) equal to 16.740669043 and -16.740669043.

Subproblem 1

x + 7.5 = 16.740669043 Simplifying x + 7.5 = 16.740669043 Reorder the terms: 7.5 + x = 16.740669043 Solving 7.5 + x = 16.740669043 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7.5' to each side of the equation. 7.5 + -7.5 + x = 16.740669043 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + x = 16.740669043 + -7.5 x = 16.740669043 + -7.5 Combine like terms: 16.740669043 + -7.5 = 9.240669043 x = 9.240669043 Simplifying x = 9.240669043

Subproblem 2

x + 7.5 = -16.740669043 Simplifying x + 7.5 = -16.740669043 Reorder the terms: 7.5 + x = -16.740669043 Solving 7.5 + x = -16.740669043 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7.5' to each side of the equation. 7.5 + -7.5 + x = -16.740669043 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + x = -16.740669043 + -7.5 x = -16.740669043 + -7.5 Combine like terms: -16.740669043 + -7.5 = -24.240669043 x = -24.240669043 Simplifying x = -24.240669043

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.240669043, -24.240669043}

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