-X^2-14X+7=0

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Solution for -X^2-14X+7=0 equation:


Simplifying
-1X2 + -14X + 7 = 0

Reorder the terms:
7 + -14X + -1X2 = 0

Solving
7 + -14X + -1X2 = 0

Solving for variable 'X'.

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-7 + 14X + X2 = 0

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + 14X + 7 + X2 = 0 + 7

Reorder the terms:
-7 + 7 + 14X + X2 = 0 + 7

Combine like terms: -7 + 7 = 0
0 + 14X + X2 = 0 + 7
14X + X2 = 0 + 7

Combine like terms: 0 + 7 = 7
14X + X2 = 7

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 = 7 + 49

Reorder the terms:
49 + 14X + X2 = 7 + 49

Combine like terms: 7 + 49 = 56
49 + 14X + X2 = 56

Factor a perfect square on the left side:
(X + 7)(X + 7) = 56

Calculate the square root of the right side: 7.483314774

Break this problem into two subproblems by setting 
(X + 7) equal to 7.483314774 and -7.483314774.

Subproblem 1

X + 7 = 7.483314774 Simplifying X + 7 = 7.483314774 Reorder the terms: 7 + X = 7.483314774 Solving 7 + X = 7.483314774 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 = 7.483314774 + -7 Combine like terms: 7 + -7 = 0 0 + X = 7.483314774 + -7 X = 7.483314774 + -7 Combine like terms: 7.483314774 + -7 = 0.483314774 X = 0.483314774 Simplifying X = 0.483314774

Subproblem 2

X + 7 = -7.483314774 Simplifying X + 7 = -7.483314774 Reorder the terms: 7 + X = -7.483314774 Solving 7 + X = -7.483314774 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 = -7.483314774 + -7 Combine like terms: 7 + -7 = 0 0 + X = -7.483314774 + -7 X = -7.483314774 + -7 Combine like terms: -7.483314774 + -7 = -14.483314774 X = -14.483314774 Simplifying X = -14.483314774

Solution

The solution to the problem is based on the solutions from the subproblems. X = {0.483314774, -14.483314774}

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