(X+7)(6-X)=6

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Solution for (X+7)(6-X)=6 equation:


Simplifying
(X + 7)(6 + -1X) = 6

Reorder the terms:
(7 + X)(6 + -1X) = 6

Multiply (7 + X) * (6 + -1X)
(7(6 + -1X) + X(6 + -1X)) = 6
((6 * 7 + -1X * 7) + X(6 + -1X)) = 6
((42 + -7X) + X(6 + -1X)) = 6
(42 + -7X + (6 * X + -1X * X)) = 6
(42 + -7X + (6X + -1X2)) = 6

Combine like terms: -7X + 6X = -1X
(42 + -1X + -1X2) = 6

Solving
42 + -1X + -1X2 = 6

Solving for variable 'X'.

Reorder the terms:
42 + -6 + -1X + -1X2 = 6 + -6

Combine like terms: 42 + -6 = 36
36 + -1X + -1X2 = 6 + -6

Combine like terms: 6 + -6 = 0
36 + -1X + -1X2 = 0

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

Divide each side by '-1'.
-36 + X + X2 = 0

Move the constant term to the right:

Add '36' to each side of the equation.
-36 + X + 36 + X2 = 0 + 36

Reorder the terms:
-36 + 36 + X + X2 = 0 + 36

Combine like terms: -36 + 36 = 0
0 + X + X2 = 0 + 36
X + X2 = 0 + 36

Combine like terms: 0 + 36 = 36
X + X2 = 36

The X term is X.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + X2 = 36 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + X2 = 36 + 0.25

Combine like terms: 36 + 0.25 = 36.25
1.25 + X2 = 36.25

Factor a perfect square on the left side:
(X + 0.5)(X + 0.5) = 36.25

Calculate the square root of the right side: 6.020797289

Break this problem into two subproblems by setting 
(X + 0.5) equal to 6.020797289 and -6.020797289.

Subproblem 1

X + 0.5 = 6.020797289 Simplifying X + 0.5 = 6.020797289 Reorder the terms: 0.5 + X = 6.020797289 Solving 0.5 + X = 6.020797289 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + X = 6.020797289 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + X = 6.020797289 + -0.5 X = 6.020797289 + -0.5 Combine like terms: 6.020797289 + -0.5 = 5.520797289 X = 5.520797289 Simplifying X = 5.520797289

Subproblem 2

X + 0.5 = -6.020797289 Simplifying X + 0.5 = -6.020797289 Reorder the terms: 0.5 + X = -6.020797289 Solving 0.5 + X = -6.020797289 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + X = -6.020797289 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + X = -6.020797289 + -0.5 X = -6.020797289 + -0.5 Combine like terms: -6.020797289 + -0.5 = -6.520797289 X = -6.520797289 Simplifying X = -6.520797289

Solution

The solution to the problem is based on the solutions from the subproblems. X = {5.520797289, -6.520797289}

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