x^2+15x=160

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Solution for x^2+15x=160 equation:


Simplifying
x2 + 15x = 160

Reorder the terms:
15x + x2 = 160

Solving
15x + x2 = 160

Solving for variable 'x'.

Reorder the terms:
-160 + 15x + x2 = 160 + -160

Combine like terms: 160 + -160 = 0
-160 + 15x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '160' to each side of the equation.
-160 + 15x + 160 + x2 = 0 + 160

Reorder the terms:
-160 + 160 + 15x + x2 = 0 + 160

Combine like terms: -160 + 160 = 0
0 + 15x + x2 = 0 + 160
15x + x2 = 0 + 160

Combine like terms: 0 + 160 = 160
15x + x2 = 160

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 = 160 + 56.25

Reorder the terms:
56.25 + 15x + x2 = 160 + 56.25

Combine like terms: 160 + 56.25 = 216.25
56.25 + 15x + x2 = 216.25

Factor a perfect square on the left side:
(x + 7.5)(x + 7.5) = 216.25

Calculate the square root of the right side: 14.70544117

Break this problem into two subproblems by setting 
(x + 7.5) equal to 14.70544117 and -14.70544117.

Subproblem 1

x + 7.5 = 14.70544117 Simplifying x + 7.5 = 14.70544117 Reorder the terms: 7.5 + x = 14.70544117 Solving 7.5 + x = 14.70544117 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 = 14.70544117 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + x = 14.70544117 + -7.5 x = 14.70544117 + -7.5 Combine like terms: 14.70544117 + -7.5 = 7.20544117 x = 7.20544117 Simplifying x = 7.20544117

Subproblem 2

x + 7.5 = -14.70544117 Simplifying x + 7.5 = -14.70544117 Reorder the terms: 7.5 + x = -14.70544117 Solving 7.5 + x = -14.70544117 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 = -14.70544117 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + x = -14.70544117 + -7.5 x = -14.70544117 + -7.5 Combine like terms: -14.70544117 + -7.5 = -22.20544117 x = -22.20544117 Simplifying x = -22.20544117

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.20544117, -22.20544117}

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