x^2-15x-25=

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Solution for x^2-15x-25= equation:


Simplifying
x2 + -15x + -25 = 0

Reorder the terms:
-25 + -15x + x2 = 0

Solving
-25 + -15x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '25' to each side of the equation.
-25 + -15x + 25 + x2 = 0 + 25

Reorder the terms:
-25 + 25 + -15x + x2 = 0 + 25

Combine like terms: -25 + 25 = 0
0 + -15x + x2 = 0 + 25
-15x + x2 = 0 + 25

Combine like terms: 0 + 25 = 25
-15x + x2 = 25

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 = 25 + 56.25

Reorder the terms:
56.25 + -15x + x2 = 25 + 56.25

Combine like terms: 25 + 56.25 = 81.25
56.25 + -15x + x2 = 81.25

Factor a perfect square on the left side:
(x + -7.5)(x + -7.5) = 81.25

Calculate the square root of the right side: 9.013878189

Break this problem into two subproblems by setting 
(x + -7.5) equal to 9.013878189 and -9.013878189.

Subproblem 1

x + -7.5 = 9.013878189 Simplifying x + -7.5 = 9.013878189 Reorder the terms: -7.5 + x = 9.013878189 Solving -7.5 + x = 9.013878189 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 = 9.013878189 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + x = 9.013878189 + 7.5 x = 9.013878189 + 7.5 Combine like terms: 9.013878189 + 7.5 = 16.513878189 x = 16.513878189 Simplifying x = 16.513878189

Subproblem 2

x + -7.5 = -9.013878189 Simplifying x + -7.5 = -9.013878189 Reorder the terms: -7.5 + x = -9.013878189 Solving -7.5 + x = -9.013878189 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 = -9.013878189 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + x = -9.013878189 + 7.5 x = -9.013878189 + 7.5 Combine like terms: -9.013878189 + 7.5 = -1.513878189 x = -1.513878189 Simplifying x = -1.513878189

Solution

The solution to the problem is based on the solutions from the subproblems. x = {16.513878189, -1.513878189}

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