X^2-2.6X=10.2

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Solution for X^2-2.6X=10.2 equation:


Simplifying
X2 + -2.6X = 10.2

Reorder the terms:
-2.6X + X2 = 10.2

Solving
-2.6X + X2 = 10.2

Solving for variable 'X'.

Reorder the terms:
-10.2 + -2.6X + X2 = 10.2 + -10.2

Combine like terms: 10.2 + -10.2 = 0.0
-10.2 + -2.6X + X2 = 0.0

Begin completing the square.

Move the constant term to the right:

Add '10.2' to each side of the equation.
-10.2 + -2.6X + 10.2 + X2 = 0.0 + 10.2

Reorder the terms:
-10.2 + 10.2 + -2.6X + X2 = 0.0 + 10.2

Combine like terms: -10.2 + 10.2 = 0.0
0.0 + -2.6X + X2 = 0.0 + 10.2
-2.6X + X2 = 0.0 + 10.2

Combine like terms: 0.0 + 10.2 = 10.2
-2.6X + X2 = 10.2

The X term is -2.6X.  Take half its coefficient (-1.3).
Square it (1.69) and add it to both sides.

Add '1.69' to each side of the equation.
-2.6X + 1.69 + X2 = 10.2 + 1.69

Reorder the terms:
1.69 + -2.6X + X2 = 10.2 + 1.69

Combine like terms: 10.2 + 1.69 = 11.89
1.69 + -2.6X + X2 = 11.89

Factor a perfect square on the left side:
(X + -1.3)(X + -1.3) = 11.89

Calculate the square root of the right side: 3.44818793

Break this problem into two subproblems by setting 
(X + -1.3) equal to 3.44818793 and -3.44818793.

Subproblem 1

X + -1.3 = 3.44818793 Simplifying X + -1.3 = 3.44818793 Reorder the terms: -1.3 + X = 3.44818793 Solving -1.3 + X = 3.44818793 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '1.3' to each side of the equation. -1.3 + 1.3 + X = 3.44818793 + 1.3 Combine like terms: -1.3 + 1.3 = 0.0 0.0 + X = 3.44818793 + 1.3 X = 3.44818793 + 1.3 Combine like terms: 3.44818793 + 1.3 = 4.74818793 X = 4.74818793 Simplifying X = 4.74818793

Subproblem 2

X + -1.3 = -3.44818793 Simplifying X + -1.3 = -3.44818793 Reorder the terms: -1.3 + X = -3.44818793 Solving -1.3 + X = -3.44818793 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '1.3' to each side of the equation. -1.3 + 1.3 + X = -3.44818793 + 1.3 Combine like terms: -1.3 + 1.3 = 0.0 0.0 + X = -3.44818793 + 1.3 X = -3.44818793 + 1.3 Combine like terms: -3.44818793 + 1.3 = -2.14818793 X = -2.14818793 Simplifying X = -2.14818793

Solution

The solution to the problem is based on the solutions from the subproblems. X = {4.74818793, -2.14818793}

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