(X+7)(X+7)=11

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Solution for (X+7)(X+7)=11 equation:


Simplifying
(X + 7)(X + 7) = 11

Reorder the terms:
(7 + X)(X + 7) = 11

Reorder the terms:
(7 + X)(7 + X) = 11

Multiply (7 + X) * (7 + X)
(7(7 + X) + X(7 + X)) = 11
((7 * 7 + X * 7) + X(7 + X)) = 11
((49 + 7X) + X(7 + X)) = 11
(49 + 7X + (7 * X + X * X)) = 11
(49 + 7X + (7X + X2)) = 11

Combine like terms: 7X + 7X = 14X
(49 + 14X + X2) = 11

Solving
49 + 14X + X2 = 11

Solving for variable 'X'.

Reorder the terms:
49 + -11 + 14X + X2 = 11 + -11

Combine like terms: 49 + -11 = 38
38 + 14X + X2 = 11 + -11

Combine like terms: 11 + -11 = 0
38 + 14X + X2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-38' to each side of the equation.
38 + 14X + -38 + X2 = 0 + -38

Reorder the terms:
38 + -38 + 14X + X2 = 0 + -38

Combine like terms: 38 + -38 = 0
0 + 14X + X2 = 0 + -38
14X + X2 = 0 + -38

Combine like terms: 0 + -38 = -38
14X + X2 = -38

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 = -38 + 49

Reorder the terms:
49 + 14X + X2 = -38 + 49

Combine like terms: -38 + 49 = 11
49 + 14X + X2 = 11

Factor a perfect square on the left side:
(X + 7)(X + 7) = 11

Calculate the square root of the right side: 3.31662479

Break this problem into two subproblems by setting 
(X + 7) equal to 3.31662479 and -3.31662479.

Subproblem 1

X + 7 = 3.31662479 Simplifying X + 7 = 3.31662479 Reorder the terms: 7 + X = 3.31662479 Solving 7 + X = 3.31662479 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 = 3.31662479 + -7 Combine like terms: 7 + -7 = 0 0 + X = 3.31662479 + -7 X = 3.31662479 + -7 Combine like terms: 3.31662479 + -7 = -3.68337521 X = -3.68337521 Simplifying X = -3.68337521

Subproblem 2

X + 7 = -3.31662479 Simplifying X + 7 = -3.31662479 Reorder the terms: 7 + X = -3.31662479 Solving 7 + X = -3.31662479 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 = -3.31662479 + -7 Combine like terms: 7 + -7 = 0 0 + X = -3.31662479 + -7 X = -3.31662479 + -7 Combine like terms: -3.31662479 + -7 = -10.31662479 X = -10.31662479 Simplifying X = -10.31662479

Solution

The solution to the problem is based on the solutions from the subproblems. X = {-3.68337521, -10.31662479}

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