5x(3x-4)-(6+2)=x

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Solution for 5x(3x-4)-(6+2)=x equation:


Simplifying
5x(3x + -4) + -1(6 + 2) = x

Reorder the terms:
5x(-4 + 3x) + -1(6 + 2) = x
(-4 * 5x + 3x * 5x) + -1(6 + 2) = x
(-20x + 15x2) + -1(6 + 2) = x

Combine like terms: 6 + 2 = 8
-20x + 15x2 + -1(8) = x

Multiply -1 * 8
-20x + 15x2 + -8 = x

Reorder the terms:
-8 + -20x + 15x2 = x

Solving
-8 + -20x + 15x2 = x

Solving for variable 'x'.

Reorder the terms:
-8 + -20x + -1x + 15x2 = x + -1x

Combine like terms: -20x + -1x = -21x
-8 + -21x + 15x2 = x + -1x

Combine like terms: x + -1x = 0
-8 + -21x + 15x2 = 0

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

Divide each side by '15'.
-0.5333333333 + -1.4x + x2 = 0

Move the constant term to the right:

Add '0.5333333333' to each side of the equation.
-0.5333333333 + -1.4x + 0.5333333333 + x2 = 0 + 0.5333333333

Reorder the terms:
-0.5333333333 + 0.5333333333 + -1.4x + x2 = 0 + 0.5333333333

Combine like terms: -0.5333333333 + 0.5333333333 = 0.0000000000
0.0000000000 + -1.4x + x2 = 0 + 0.5333333333
-1.4x + x2 = 0 + 0.5333333333

Combine like terms: 0 + 0.5333333333 = 0.5333333333
-1.4x + x2 = 0.5333333333

The x term is -1.4x.  Take half its coefficient (-0.7).
Square it (0.49) and add it to both sides.

Add '0.49' to each side of the equation.
-1.4x + 0.49 + x2 = 0.5333333333 + 0.49

Reorder the terms:
0.49 + -1.4x + x2 = 0.5333333333 + 0.49

Combine like terms: 0.5333333333 + 0.49 = 1.0233333333
0.49 + -1.4x + x2 = 1.0233333333

Factor a perfect square on the left side:
(x + -0.7)(x + -0.7) = 1.0233333333

Calculate the square root of the right side: 1.011599394

Break this problem into two subproblems by setting 
(x + -0.7) equal to 1.011599394 and -1.011599394.

Subproblem 1

x + -0.7 = 1.011599394 Simplifying x + -0.7 = 1.011599394 Reorder the terms: -0.7 + x = 1.011599394 Solving -0.7 + x = 1.011599394 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.7' to each side of the equation. -0.7 + 0.7 + x = 1.011599394 + 0.7 Combine like terms: -0.7 + 0.7 = 0.0 0.0 + x = 1.011599394 + 0.7 x = 1.011599394 + 0.7 Combine like terms: 1.011599394 + 0.7 = 1.711599394 x = 1.711599394 Simplifying x = 1.711599394

Subproblem 2

x + -0.7 = -1.011599394 Simplifying x + -0.7 = -1.011599394 Reorder the terms: -0.7 + x = -1.011599394 Solving -0.7 + x = -1.011599394 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.7' to each side of the equation. -0.7 + 0.7 + x = -1.011599394 + 0.7 Combine like terms: -0.7 + 0.7 = 0.0 0.0 + x = -1.011599394 + 0.7 x = -1.011599394 + 0.7 Combine like terms: -1.011599394 + 0.7 = -0.311599394 x = -0.311599394 Simplifying x = -0.311599394

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.711599394, -0.311599394}

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