(3x+4)(x+9)=53x+39

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Solution for (3x+4)(x+9)=53x+39 equation:


Simplifying
(3x + 4)(x + 9) = 53x + 39

Reorder the terms:
(4 + 3x)(x + 9) = 53x + 39

Reorder the terms:
(4 + 3x)(9 + x) = 53x + 39

Multiply (4 + 3x) * (9 + x)
(4(9 + x) + 3x * (9 + x)) = 53x + 39
((9 * 4 + x * 4) + 3x * (9 + x)) = 53x + 39
((36 + 4x) + 3x * (9 + x)) = 53x + 39
(36 + 4x + (9 * 3x + x * 3x)) = 53x + 39
(36 + 4x + (27x + 3x2)) = 53x + 39

Combine like terms: 4x + 27x = 31x
(36 + 31x + 3x2) = 53x + 39

Reorder the terms:
36 + 31x + 3x2 = 39 + 53x

Solving
36 + 31x + 3x2 = 39 + 53x

Solving for variable 'x'.

Reorder the terms:
36 + -39 + 31x + -53x + 3x2 = 39 + 53x + -39 + -53x

Combine like terms: 36 + -39 = -3
-3 + 31x + -53x + 3x2 = 39 + 53x + -39 + -53x

Combine like terms: 31x + -53x = -22x
-3 + -22x + 3x2 = 39 + 53x + -39 + -53x

Reorder the terms:
-3 + -22x + 3x2 = 39 + -39 + 53x + -53x

Combine like terms: 39 + -39 = 0
-3 + -22x + 3x2 = 0 + 53x + -53x
-3 + -22x + 3x2 = 53x + -53x

Combine like terms: 53x + -53x = 0
-3 + -22x + 3x2 = 0

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

Divide each side by '3'.
-1 + -7.333333333x + x2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -7.333333333x + 1 + x2 = 0 + 1

Reorder the terms:
-1 + 1 + -7.333333333x + x2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -7.333333333x + x2 = 0 + 1
-7.333333333x + x2 = 0 + 1

Combine like terms: 0 + 1 = 1
-7.333333333x + x2 = 1

The x term is -7.333333333x.  Take half its coefficient (-3.666666667).
Square it (13.44444445) and add it to both sides.

Add '13.44444445' to each side of the equation.
-7.333333333x + 13.44444445 + x2 = 1 + 13.44444445

Reorder the terms:
13.44444445 + -7.333333333x + x2 = 1 + 13.44444445

Combine like terms: 1 + 13.44444445 = 14.44444445
13.44444445 + -7.333333333x + x2 = 14.44444445

Factor a perfect square on the left side:
(x + -3.666666667)(x + -3.666666667) = 14.44444445

Calculate the square root of the right side: 3.800584751

Break this problem into two subproblems by setting 
(x + -3.666666667) equal to 3.800584751 and -3.800584751.

Subproblem 1

x + -3.666666667 = 3.800584751 Simplifying x + -3.666666667 = 3.800584751 Reorder the terms: -3.666666667 + x = 3.800584751 Solving -3.666666667 + x = 3.800584751 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.666666667' to each side of the equation. -3.666666667 + 3.666666667 + x = 3.800584751 + 3.666666667 Combine like terms: -3.666666667 + 3.666666667 = 0.000000000 0.000000000 + x = 3.800584751 + 3.666666667 x = 3.800584751 + 3.666666667 Combine like terms: 3.800584751 + 3.666666667 = 7.467251418 x = 7.467251418 Simplifying x = 7.467251418

Subproblem 2

x + -3.666666667 = -3.800584751 Simplifying x + -3.666666667 = -3.800584751 Reorder the terms: -3.666666667 + x = -3.800584751 Solving -3.666666667 + x = -3.800584751 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.666666667' to each side of the equation. -3.666666667 + 3.666666667 + x = -3.800584751 + 3.666666667 Combine like terms: -3.666666667 + 3.666666667 = 0.000000000 0.000000000 + x = -3.800584751 + 3.666666667 x = -3.800584751 + 3.666666667 Combine like terms: -3.800584751 + 3.666666667 = -0.133918084 x = -0.133918084 Simplifying x = -0.133918084

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.467251418, -0.133918084}

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