x(2x-7)=6(2x+3)

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Solution for x(2x-7)=6(2x+3) equation:


Simplifying
x(2x + -7) = 6(2x + 3)

Reorder the terms:
x(-7 + 2x) = 6(2x + 3)
(-7 * x + 2x * x) = 6(2x + 3)
(-7x + 2x2) = 6(2x + 3)

Reorder the terms:
-7x + 2x2 = 6(3 + 2x)
-7x + 2x2 = (3 * 6 + 2x * 6)
-7x + 2x2 = (18 + 12x)

Solving
-7x + 2x2 = 18 + 12x

Solving for variable 'x'.

Reorder the terms:
-18 + -7x + -12x + 2x2 = 18 + 12x + -18 + -12x

Combine like terms: -7x + -12x = -19x
-18 + -19x + 2x2 = 18 + 12x + -18 + -12x

Reorder the terms:
-18 + -19x + 2x2 = 18 + -18 + 12x + -12x

Combine like terms: 18 + -18 = 0
-18 + -19x + 2x2 = 0 + 12x + -12x
-18 + -19x + 2x2 = 12x + -12x

Combine like terms: 12x + -12x = 0
-18 + -19x + 2x2 = 0

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

Divide each side by '2'.
-9 + -9.5x + x2 = 0

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + -9.5x + 9 + x2 = 0 + 9

Reorder the terms:
-9 + 9 + -9.5x + x2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -9.5x + x2 = 0 + 9
-9.5x + x2 = 0 + 9

Combine like terms: 0 + 9 = 9
-9.5x + x2 = 9

The x term is -9.5x.  Take half its coefficient (-4.75).
Square it (22.5625) and add it to both sides.

Add '22.5625' to each side of the equation.
-9.5x + 22.5625 + x2 = 9 + 22.5625

Reorder the terms:
22.5625 + -9.5x + x2 = 9 + 22.5625

Combine like terms: 9 + 22.5625 = 31.5625
22.5625 + -9.5x + x2 = 31.5625

Factor a perfect square on the left side:
(x + -4.75)(x + -4.75) = 31.5625

Calculate the square root of the right side: 5.618051264

Break this problem into two subproblems by setting 
(x + -4.75) equal to 5.618051264 and -5.618051264.

Subproblem 1

x + -4.75 = 5.618051264 Simplifying x + -4.75 = 5.618051264 Reorder the terms: -4.75 + x = 5.618051264 Solving -4.75 + x = 5.618051264 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.75' to each side of the equation. -4.75 + 4.75 + x = 5.618051264 + 4.75 Combine like terms: -4.75 + 4.75 = 0.00 0.00 + x = 5.618051264 + 4.75 x = 5.618051264 + 4.75 Combine like terms: 5.618051264 + 4.75 = 10.368051264 x = 10.368051264 Simplifying x = 10.368051264

Subproblem 2

x + -4.75 = -5.618051264 Simplifying x + -4.75 = -5.618051264 Reorder the terms: -4.75 + x = -5.618051264 Solving -4.75 + x = -5.618051264 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.75' to each side of the equation. -4.75 + 4.75 + x = -5.618051264 + 4.75 Combine like terms: -4.75 + 4.75 = 0.00 0.00 + x = -5.618051264 + 4.75 x = -5.618051264 + 4.75 Combine like terms: -5.618051264 + 4.75 = -0.868051264 x = -0.868051264 Simplifying x = -0.868051264

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.368051264, -0.868051264}

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