x^2-1.375x=7

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Solution for x^2-1.375x=7 equation: 


Simplifying
x2 + -1.375x = 7

Reorder the terms:
-1.375x + x2 = 7

Solving
-1.375x + x2 = 7

Solving for variable 'x'.

Reorder the terms:
-7 + -1.375x + x2 = 7 + -7

Combine like terms: 7 + -7 = 0
-7 + -1.375x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + -1.375x + 7 + x2 = 0 + 7

Reorder the terms:
-7 + 7 + -1.375x + x2 = 0 + 7

Combine like terms: -7 + 7 = 0
0 + -1.375x + x2 = 0 + 7
-1.375x + x2 = 0 + 7

Combine like terms: 0 + 7 = 7
-1.375x + x2 = 7

The x term is -1.375x.  Take half its coefficient (-0.6875).
Square it (0.47265625) and add it to both sides.

Add '0.47265625' to each side of the equation.
-1.375x + 0.47265625 + x2 = 7 + 0.47265625

Reorder the terms:
0.47265625 + -1.375x + x2 = 7 + 0.47265625

Combine like terms: 7 + 0.47265625 = 7.47265625
0.47265625 + -1.375x + x2 = 7.47265625

Factor a perfect square on the left side:
(x + -0.6875)(x + -0.6875) = 7.47265625

Calculate the square root of the right side: 2.733615966

Break this problem into two subproblems by setting 
(x + -0.6875) equal to 2.733615966 and -2.733615966.


Subproblem 1
x + -0.6875 = 2.733615966

Simplifying
x + -0.6875 = 2.733615966

Reorder the terms:
-0.6875 + x = 2.733615966

Solving
-0.6875 + x = 2.733615966

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '0.6875' to each side of the equation.
-0.6875 + 0.6875 + x = 2.733615966 + 0.6875

Combine like terms: -0.6875 + 0.6875 = 0.0000
0.0000 + x = 2.733615966 + 0.6875
x = 2.733615966 + 0.6875

Combine like terms: 2.733615966 + 0.6875 = 3.421115966
x = 3.421115966

Simplifying
x = 3.421115966


Subproblem 2
x + -0.6875 = -2.733615966

Simplifying
x + -0.6875 = -2.733615966

Reorder the terms:
-0.6875 + x = -2.733615966

Solving
-0.6875 + x = -2.733615966

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '0.6875' to each side of the equation.
-0.6875 + 0.6875 + x = -2.733615966 + 0.6875

Combine like terms: -0.6875 + 0.6875 = 0.0000
0.0000 + x = -2.733615966 + 0.6875
x = -2.733615966 + 0.6875

Combine like terms: -2.733615966 + 0.6875 = -2.046115966
x = -2.046115966

Simplifying
x = -2.046115966


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {3.421115966, -2.046115966}

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