0=122+7x-5x(x)

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Solution for 0=122+7x-5x(x) equation:


Simplifying
0 = 122 + 7x + -5x(x)

Multiply x * x
0 = 122 + 7x + -5x2

Solving
0 = 122 + 7x + -5x2

Solving for variable 'x'.

Combine like terms: 0 + -122 = -122
-122 + -7x + 5x2 = 122 + 7x + -5x2 + -122 + -7x + 5x2

Reorder the terms:
-122 + -7x + 5x2 = 122 + -122 + 7x + -7x + -5x2 + 5x2

Combine like terms: 122 + -122 = 0
-122 + -7x + 5x2 = 0 + 7x + -7x + -5x2 + 5x2
-122 + -7x + 5x2 = 7x + -7x + -5x2 + 5x2

Combine like terms: 7x + -7x = 0
-122 + -7x + 5x2 = 0 + -5x2 + 5x2
-122 + -7x + 5x2 = -5x2 + 5x2

Combine like terms: -5x2 + 5x2 = 0
-122 + -7x + 5x2 = 0

Begin completing the square.  Divide all terms by
5 the coefficient of the squared term: 

Divide each side by '5'.
-24.4 + -1.4x + x2 = 0

Move the constant term to the right:

Add '24.4' to each side of the equation.
-24.4 + -1.4x + 24.4 + x2 = 0 + 24.4

Reorder the terms:
-24.4 + 24.4 + -1.4x + x2 = 0 + 24.4

Combine like terms: -24.4 + 24.4 = 0.0
0.0 + -1.4x + x2 = 0 + 24.4
-1.4x + x2 = 0 + 24.4

Combine like terms: 0 + 24.4 = 24.4
-1.4x + x2 = 24.4

The x term is -1.4x.  Take half its coefficient (-0.7).
Square it (0.49) and add it to both sides.

Add '0.49' to each side of the equation.
-1.4x + 0.49 + x2 = 24.4 + 0.49

Reorder the terms:
0.49 + -1.4x + x2 = 24.4 + 0.49

Combine like terms: 24.4 + 0.49 = 24.89
0.49 + -1.4x + x2 = 24.89

Factor a perfect square on the left side:
(x + -0.7)(x + -0.7) = 24.89

Calculate the square root of the right side: 4.988987873

Break this problem into two subproblems by setting 
(x + -0.7) equal to 4.988987873 and -4.988987873.

Subproblem 1

x + -0.7 = 4.988987873 Simplifying x + -0.7 = 4.988987873 Reorder the terms: -0.7 + x = 4.988987873 Solving -0.7 + x = 4.988987873 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.7' to each side of the equation. -0.7 + 0.7 + x = 4.988987873 + 0.7 Combine like terms: -0.7 + 0.7 = 0.0 0.0 + x = 4.988987873 + 0.7 x = 4.988987873 + 0.7 Combine like terms: 4.988987873 + 0.7 = 5.688987873 x = 5.688987873 Simplifying x = 5.688987873

Subproblem 2

x + -0.7 = -4.988987873 Simplifying x + -0.7 = -4.988987873 Reorder the terms: -0.7 + x = -4.988987873 Solving -0.7 + x = -4.988987873 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.7' to each side of the equation. -0.7 + 0.7 + x = -4.988987873 + 0.7 Combine like terms: -0.7 + 0.7 = 0.0 0.0 + x = -4.988987873 + 0.7 x = -4.988987873 + 0.7 Combine like terms: -4.988987873 + 0.7 = -4.288987873 x = -4.288987873 Simplifying x = -4.288987873

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.688987873, -4.288987873}

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