x^2-71=14x

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Solution for x^2-71=14x equation:


Simplifying
x2 + -71 = 14x

Reorder the terms:
-71 + x2 = 14x

Solving
-71 + x2 = 14x

Solving for variable 'x'.

Reorder the terms:
-71 + -14x + x2 = 14x + -14x

Combine like terms: 14x + -14x = 0
-71 + -14x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '71' to each side of the equation.
-71 + -14x + 71 + x2 = 0 + 71

Reorder the terms:
-71 + 71 + -14x + x2 = 0 + 71

Combine like terms: -71 + 71 = 0
0 + -14x + x2 = 0 + 71
-14x + x2 = 0 + 71

Combine like terms: 0 + 71 = 71
-14x + x2 = 71

The x term is -14x.  Take half its coefficient (-7).
Square it (49) and add it to both sides.

Add '49' to each side of the equation.
-14x + 49 + x2 = 71 + 49

Reorder the terms:
49 + -14x + x2 = 71 + 49

Combine like terms: 71 + 49 = 120
49 + -14x + x2 = 120

Factor a perfect square on the left side:
(x + -7)(x + -7) = 120

Calculate the square root of the right side: 10.95445115

Break this problem into two subproblems by setting 
(x + -7) equal to 10.95445115 and -10.95445115.

Subproblem 1

x + -7 = 10.95445115 Simplifying x + -7 = 10.95445115 Reorder the terms: -7 + x = 10.95445115 Solving -7 + x = 10.95445115 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + x = 10.95445115 + 7 Combine like terms: -7 + 7 = 0 0 + x = 10.95445115 + 7 x = 10.95445115 + 7 Combine like terms: 10.95445115 + 7 = 17.95445115 x = 17.95445115 Simplifying x = 17.95445115

Subproblem 2

x + -7 = -10.95445115 Simplifying x + -7 = -10.95445115 Reorder the terms: -7 + x = -10.95445115 Solving -7 + x = -10.95445115 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + x = -10.95445115 + 7 Combine like terms: -7 + 7 = 0 0 + x = -10.95445115 + 7 x = -10.95445115 + 7 Combine like terms: -10.95445115 + 7 = -3.95445115 x = -3.95445115 Simplifying x = -3.95445115

Solution

The solution to the problem is based on the solutions from the subproblems. x = {17.95445115, -3.95445115}

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