(x)(x)=13x+-28

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Solution for (x)(x)=13x+-28 equation:


Simplifying
(x)(x) = 13x + -28

Multiply x * x
x2 = 13x + -28

Reorder the terms:
x2 = -28 + 13x

Solving
x2 = -28 + 13x

Solving for variable 'x'.

Reorder the terms:
28 + -13x + x2 = -28 + 13x + 28 + -13x

Reorder the terms:
28 + -13x + x2 = -28 + 28 + 13x + -13x

Combine like terms: -28 + 28 = 0
28 + -13x + x2 = 0 + 13x + -13x
28 + -13x + x2 = 13x + -13x

Combine like terms: 13x + -13x = 0
28 + -13x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-28' to each side of the equation.
28 + -13x + -28 + x2 = 0 + -28

Reorder the terms:
28 + -28 + -13x + x2 = 0 + -28

Combine like terms: 28 + -28 = 0
0 + -13x + x2 = 0 + -28
-13x + x2 = 0 + -28

Combine like terms: 0 + -28 = -28
-13x + x2 = -28

The x term is -13x.  Take half its coefficient (-6.5).
Square it (42.25) and add it to both sides.

Add '42.25' to each side of the equation.
-13x + 42.25 + x2 = -28 + 42.25

Reorder the terms:
42.25 + -13x + x2 = -28 + 42.25

Combine like terms: -28 + 42.25 = 14.25
42.25 + -13x + x2 = 14.25

Factor a perfect square on the left side:
(x + -6.5)(x + -6.5) = 14.25

Calculate the square root of the right side: 3.774917218

Break this problem into two subproblems by setting 
(x + -6.5) equal to 3.774917218 and -3.774917218.

Subproblem 1

x + -6.5 = 3.774917218 Simplifying x + -6.5 = 3.774917218 Reorder the terms: -6.5 + x = 3.774917218 Solving -6.5 + x = 3.774917218 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.5' to each side of the equation. -6.5 + 6.5 + x = 3.774917218 + 6.5 Combine like terms: -6.5 + 6.5 = 0.0 0.0 + x = 3.774917218 + 6.5 x = 3.774917218 + 6.5 Combine like terms: 3.774917218 + 6.5 = 10.274917218 x = 10.274917218 Simplifying x = 10.274917218

Subproblem 2

x + -6.5 = -3.774917218 Simplifying x + -6.5 = -3.774917218 Reorder the terms: -6.5 + x = -3.774917218 Solving -6.5 + x = -3.774917218 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.5' to each side of the equation. -6.5 + 6.5 + x = -3.774917218 + 6.5 Combine like terms: -6.5 + 6.5 = 0.0 0.0 + x = -3.774917218 + 6.5 x = -3.774917218 + 6.5 Combine like terms: -3.774917218 + 6.5 = 2.725082782 x = 2.725082782 Simplifying x = 2.725082782

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.274917218, 2.725082782}

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