84=(x+6)(x)

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Solution for 84=(x+6)(x) equation:


Simplifying
84 = (x + 6)(x)

Reorder the terms:
84 = (6 + x)(x)

Reorder the terms for easier multiplication:
84 = x(6 + x)
84 = (6 * x + x * x)
84 = (6x + x2)

Solving
84 = 6x + x2

Solving for variable 'x'.

Reorder the terms:
84 + -6x + -1x2 = 6x + -6x + x2 + -1x2

Combine like terms: 6x + -6x = 0
84 + -6x + -1x2 = 0 + x2 + -1x2
84 + -6x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
84 + -6x + -1x2 = 0

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

Divide each side by '-1'.
-84 + 6x + x2 = 0

Move the constant term to the right:

Add '84' to each side of the equation.
-84 + 6x + 84 + x2 = 0 + 84

Reorder the terms:
-84 + 84 + 6x + x2 = 0 + 84

Combine like terms: -84 + 84 = 0
0 + 6x + x2 = 0 + 84
6x + x2 = 0 + 84

Combine like terms: 0 + 84 = 84
6x + x2 = 84

The x term is 6x.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6x + 9 + x2 = 84 + 9

Reorder the terms:
9 + 6x + x2 = 84 + 9

Combine like terms: 84 + 9 = 93
9 + 6x + x2 = 93

Factor a perfect square on the left side:
(x + 3)(x + 3) = 93

Calculate the square root of the right side: 9.643650761

Break this problem into two subproblems by setting 
(x + 3) equal to 9.643650761 and -9.643650761.

Subproblem 1

x + 3 = 9.643650761 Simplifying x + 3 = 9.643650761 Reorder the terms: 3 + x = 9.643650761 Solving 3 + x = 9.643650761 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 9.643650761 + -3 Combine like terms: 3 + -3 = 0 0 + x = 9.643650761 + -3 x = 9.643650761 + -3 Combine like terms: 9.643650761 + -3 = 6.643650761 x = 6.643650761 Simplifying x = 6.643650761

Subproblem 2

x + 3 = -9.643650761 Simplifying x + 3 = -9.643650761 Reorder the terms: 3 + x = -9.643650761 Solving 3 + x = -9.643650761 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = -9.643650761 + -3 Combine like terms: 3 + -3 = 0 0 + x = -9.643650761 + -3 x = -9.643650761 + -3 Combine like terms: -9.643650761 + -3 = -12.643650761 x = -12.643650761 Simplifying x = -12.643650761

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.643650761, -12.643650761}

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