5x(x+4)=3x+23

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Solution for 5x(x+4)=3x+23 equation:


Simplifying
5x(x + 4) = 3x + 23

Reorder the terms:
5x(4 + x) = 3x + 23
(4 * 5x + x * 5x) = 3x + 23
(20x + 5x2) = 3x + 23

Reorder the terms:
20x + 5x2 = 23 + 3x

Solving
20x + 5x2 = 23 + 3x

Solving for variable 'x'.

Reorder the terms:
-23 + 20x + -3x + 5x2 = 23 + 3x + -23 + -3x

Combine like terms: 20x + -3x = 17x
-23 + 17x + 5x2 = 23 + 3x + -23 + -3x

Reorder the terms:
-23 + 17x + 5x2 = 23 + -23 + 3x + -3x

Combine like terms: 23 + -23 = 0
-23 + 17x + 5x2 = 0 + 3x + -3x
-23 + 17x + 5x2 = 3x + -3x

Combine like terms: 3x + -3x = 0
-23 + 17x + 5x2 = 0

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

Divide each side by '5'.
-4.6 + 3.4x + x2 = 0

Move the constant term to the right:

Add '4.6' to each side of the equation.
-4.6 + 3.4x + 4.6 + x2 = 0 + 4.6

Reorder the terms:
-4.6 + 4.6 + 3.4x + x2 = 0 + 4.6

Combine like terms: -4.6 + 4.6 = 0.0
0.0 + 3.4x + x2 = 0 + 4.6
3.4x + x2 = 0 + 4.6

Combine like terms: 0 + 4.6 = 4.6
3.4x + x2 = 4.6

The x term is 3.4x.  Take half its coefficient (1.7).
Square it (2.89) and add it to both sides.

Add '2.89' to each side of the equation.
3.4x + 2.89 + x2 = 4.6 + 2.89

Reorder the terms:
2.89 + 3.4x + x2 = 4.6 + 2.89

Combine like terms: 4.6 + 2.89 = 7.49
2.89 + 3.4x + x2 = 7.49

Factor a perfect square on the left side:
(x + 1.7)(x + 1.7) = 7.49

Calculate the square root of the right side: 2.736786437

Break this problem into two subproblems by setting 
(x + 1.7) equal to 2.736786437 and -2.736786437.

Subproblem 1

x + 1.7 = 2.736786437 Simplifying x + 1.7 = 2.736786437 Reorder the terms: 1.7 + x = 2.736786437 Solving 1.7 + x = 2.736786437 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.7' to each side of the equation. 1.7 + -1.7 + x = 2.736786437 + -1.7 Combine like terms: 1.7 + -1.7 = 0.0 0.0 + x = 2.736786437 + -1.7 x = 2.736786437 + -1.7 Combine like terms: 2.736786437 + -1.7 = 1.036786437 x = 1.036786437 Simplifying x = 1.036786437

Subproblem 2

x + 1.7 = -2.736786437 Simplifying x + 1.7 = -2.736786437 Reorder the terms: 1.7 + x = -2.736786437 Solving 1.7 + x = -2.736786437 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.7' to each side of the equation. 1.7 + -1.7 + x = -2.736786437 + -1.7 Combine like terms: 1.7 + -1.7 = 0.0 0.0 + x = -2.736786437 + -1.7 x = -2.736786437 + -1.7 Combine like terms: -2.736786437 + -1.7 = -4.436786437 x = -4.436786437 Simplifying x = -4.436786437

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.036786437, -4.436786437}

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