x^2+15x-53=0

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Solution for x^2+15x-53=0 equation:


Simplifying
x2 + 15x + -53 = 0

Reorder the terms:
-53 + 15x + x2 = 0

Solving
-53 + 15x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '53' to each side of the equation.
-53 + 15x + 53 + x2 = 0 + 53

Reorder the terms:
-53 + 53 + 15x + x2 = 0 + 53

Combine like terms: -53 + 53 = 0
0 + 15x + x2 = 0 + 53
15x + x2 = 0 + 53

Combine like terms: 0 + 53 = 53
15x + x2 = 53

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 = 53 + 56.25

Reorder the terms:
56.25 + 15x + x2 = 53 + 56.25

Combine like terms: 53 + 56.25 = 109.25
56.25 + 15x + x2 = 109.25

Factor a perfect square on the left side:
(x + 7.5)(x + 7.5) = 109.25

Calculate the square root of the right side: 10.45227248

Break this problem into two subproblems by setting 
(x + 7.5) equal to 10.45227248 and -10.45227248.

Subproblem 1

x + 7.5 = 10.45227248 Simplifying x + 7.5 = 10.45227248 Reorder the terms: 7.5 + x = 10.45227248 Solving 7.5 + x = 10.45227248 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 = 10.45227248 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + x = 10.45227248 + -7.5 x = 10.45227248 + -7.5 Combine like terms: 10.45227248 + -7.5 = 2.95227248 x = 2.95227248 Simplifying x = 2.95227248

Subproblem 2

x + 7.5 = -10.45227248 Simplifying x + 7.5 = -10.45227248 Reorder the terms: 7.5 + x = -10.45227248 Solving 7.5 + x = -10.45227248 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 = -10.45227248 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + x = -10.45227248 + -7.5 x = -10.45227248 + -7.5 Combine like terms: -10.45227248 + -7.5 = -17.95227248 x = -17.95227248 Simplifying x = -17.95227248

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.95227248, -17.95227248}

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