1x^2+14x-15=15

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Solution for 1x^2+14x-15=15 equation:


Simplifying
1x2 + 14x + -15 = 15

Reorder the terms:
-15 + 14x + 1x2 = 15

Solving
-15 + 14x + 1x2 = 15

Solving for variable 'x'.

Reorder the terms:
-15 + -15 + 14x + 1x2 = 15 + -15

Combine like terms: -15 + -15 = -30
-30 + 14x + 1x2 = 15 + -15

Combine like terms: 15 + -15 = 0
-30 + 14x + 1x2 = 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 = 1.888194417 x = 1.888194417 Simplifying x = 1.888194417

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 = -15.888194417 x = -15.888194417 Simplifying x = -15.888194417

Solution

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

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