5x(x+6)=4(x+7)

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Solution for 5x(x+6)=4(x+7) equation:


Simplifying
5x(x + 6) = 4(x + 7)

Reorder the terms:
5x(6 + x) = 4(x + 7)
(6 * 5x + x * 5x) = 4(x + 7)
(30x + 5x2) = 4(x + 7)

Reorder the terms:
30x + 5x2 = 4(7 + x)
30x + 5x2 = (7 * 4 + x * 4)
30x + 5x2 = (28 + 4x)

Solving
30x + 5x2 = 28 + 4x

Solving for variable 'x'.

Reorder the terms:
-28 + 30x + -4x + 5x2 = 28 + 4x + -28 + -4x

Combine like terms: 30x + -4x = 26x
-28 + 26x + 5x2 = 28 + 4x + -28 + -4x

Reorder the terms:
-28 + 26x + 5x2 = 28 + -28 + 4x + -4x

Combine like terms: 28 + -28 = 0
-28 + 26x + 5x2 = 0 + 4x + -4x
-28 + 26x + 5x2 = 4x + -4x

Combine like terms: 4x + -4x = 0
-28 + 26x + 5x2 = 0

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

Divide each side by '5'.
-5.6 + 5.2x + x2 = 0

Move the constant term to the right:

Add '5.6' to each side of the equation.
-5.6 + 5.2x + 5.6 + x2 = 0 + 5.6

Reorder the terms:
-5.6 + 5.6 + 5.2x + x2 = 0 + 5.6

Combine like terms: -5.6 + 5.6 = 0.0
0.0 + 5.2x + x2 = 0 + 5.6
5.2x + x2 = 0 + 5.6

Combine like terms: 0 + 5.6 = 5.6
5.2x + x2 = 5.6

The x term is 5.2x.  Take half its coefficient (2.6).
Square it (6.76) and add it to both sides.

Add '6.76' to each side of the equation.
5.2x + 6.76 + x2 = 5.6 + 6.76

Reorder the terms:
6.76 + 5.2x + x2 = 5.6 + 6.76

Combine like terms: 5.6 + 6.76 = 12.36
6.76 + 5.2x + x2 = 12.36

Factor a perfect square on the left side:
(x + 2.6)(x + 2.6) = 12.36

Calculate the square root of the right side: 3.515679166

Break this problem into two subproblems by setting 
(x + 2.6) equal to 3.515679166 and -3.515679166.

Subproblem 1

x + 2.6 = 3.515679166 Simplifying x + 2.6 = 3.515679166 Reorder the terms: 2.6 + x = 3.515679166 Solving 2.6 + x = 3.515679166 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.6' to each side of the equation. 2.6 + -2.6 + x = 3.515679166 + -2.6 Combine like terms: 2.6 + -2.6 = 0.0 0.0 + x = 3.515679166 + -2.6 x = 3.515679166 + -2.6 Combine like terms: 3.515679166 + -2.6 = 0.915679166 x = 0.915679166 Simplifying x = 0.915679166

Subproblem 2

x + 2.6 = -3.515679166 Simplifying x + 2.6 = -3.515679166 Reorder the terms: 2.6 + x = -3.515679166 Solving 2.6 + x = -3.515679166 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.6' to each side of the equation. 2.6 + -2.6 + x = -3.515679166 + -2.6 Combine like terms: 2.6 + -2.6 = 0.0 0.0 + x = -3.515679166 + -2.6 x = -3.515679166 + -2.6 Combine like terms: -3.515679166 + -2.6 = -6.115679166 x = -6.115679166 Simplifying x = -6.115679166

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.915679166, -6.115679166}

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