x^2-14x=30

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Solution for x^2-14x=30 equation:


Simplifying
x2 + -14x = 30

Reorder the terms:
-14x + x2 = 30

Solving
-14x + x2 = 30

Solving for variable 'x'.

Reorder the terms:
-30 + -14x + x2 = 30 + -30

Combine like terms: 30 + -30 = 0
-30 + -14x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '30' to each side of the equation.
-30 + -14x + 30 + x2 = 0 + 30

Reorder the terms:
-30 + 30 + -14x + x2 = 0 + 30

Combine like terms: -30 + 30 = 0
0 + -14x + x2 = 0 + 30
-14x + x2 = 0 + 30

Combine like terms: 0 + 30 = 30
-14x + x2 = 30

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 = 30 + 49

Reorder the terms:
49 + -14x + x2 = 30 + 49

Combine like terms: 30 + 49 = 79
49 + -14x + x2 = 79

Factor a perfect square on the left side:
(x + -7)(x + -7) = 79

Calculate the square root of the right side: 8.888194417

Break this problem into two subproblems by setting 
(x + -7) equal to 8.888194417 and -8.888194417.

Subproblem 1

x + -7 = 8.888194417 Simplifying x + -7 = 8.888194417 Reorder the terms: -7 + x = 8.888194417 Solving -7 + x = 8.888194417 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 = 8.888194417 + 7 Combine like terms: -7 + 7 = 0 0 + x = 8.888194417 + 7 x = 8.888194417 + 7 Combine like terms: 8.888194417 + 7 = 15.888194417 x = 15.888194417 Simplifying x = 15.888194417

Subproblem 2

x + -7 = -8.888194417 Simplifying x + -7 = -8.888194417 Reorder the terms: -7 + x = -8.888194417 Solving -7 + x = -8.888194417 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 = -8.888194417 + 7 Combine like terms: -7 + 7 = 0 0 + x = -8.888194417 + 7 x = -8.888194417 + 7 Combine like terms: -8.888194417 + 7 = -1.888194417 x = -1.888194417 Simplifying x = -1.888194417

Solution

The solution to the problem is based on the solutions from the subproblems. x = {15.888194417, -1.888194417}

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