3(x-4)+2x(x-1)=7

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Solution for 3(x-4)+2x(x-1)=7 equation:


Simplifying
3(x + -4) + 2x(x + -1) = 7

Reorder the terms:
3(-4 + x) + 2x(x + -1) = 7
(-4 * 3 + x * 3) + 2x(x + -1) = 7
(-12 + 3x) + 2x(x + -1) = 7

Reorder the terms:
-12 + 3x + 2x(-1 + x) = 7
-12 + 3x + (-1 * 2x + x * 2x) = 7
-12 + 3x + (-2x + 2x2) = 7

Combine like terms: 3x + -2x = 1x
-12 + 1x + 2x2 = 7

Solving
-12 + 1x + 2x2 = 7

Solving for variable 'x'.

Reorder the terms:
-12 + -7 + 1x + 2x2 = 7 + -7

Combine like terms: -12 + -7 = -19
-19 + 1x + 2x2 = 7 + -7

Combine like terms: 7 + -7 = 0
-19 + 1x + 2x2 = 0

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

Divide each side by '2'.
-9.5 + 0.5x + x2 = 0

Move the constant term to the right:

Add '9.5' to each side of the equation.
-9.5 + 0.5x + 9.5 + x2 = 0 + 9.5

Reorder the terms:
-9.5 + 9.5 + 0.5x + x2 = 0 + 9.5

Combine like terms: -9.5 + 9.5 = 0.0
0.0 + 0.5x + x2 = 0 + 9.5
0.5x + x2 = 0 + 9.5

Combine like terms: 0 + 9.5 = 9.5
0.5x + x2 = 9.5

The x term is 0.5x.  Take half its coefficient (0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
0.5x + 0.0625 + x2 = 9.5 + 0.0625

Reorder the terms:
0.0625 + 0.5x + x2 = 9.5 + 0.0625

Combine like terms: 9.5 + 0.0625 = 9.5625
0.0625 + 0.5x + x2 = 9.5625

Factor a perfect square on the left side:
(x + 0.25)(x + 0.25) = 9.5625

Calculate the square root of the right side: 3.092329219

Break this problem into two subproblems by setting 
(x + 0.25) equal to 3.092329219 and -3.092329219.

Subproblem 1

x + 0.25 = 3.092329219 Simplifying x + 0.25 = 3.092329219 Reorder the terms: 0.25 + x = 3.092329219 Solving 0.25 + x = 3.092329219 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + x = 3.092329219 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = 3.092329219 + -0.25 x = 3.092329219 + -0.25 Combine like terms: 3.092329219 + -0.25 = 2.842329219 x = 2.842329219 Simplifying x = 2.842329219

Subproblem 2

x + 0.25 = -3.092329219 Simplifying x + 0.25 = -3.092329219 Reorder the terms: 0.25 + x = -3.092329219 Solving 0.25 + x = -3.092329219 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + x = -3.092329219 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = -3.092329219 + -0.25 x = -3.092329219 + -0.25 Combine like terms: -3.092329219 + -0.25 = -3.342329219 x = -3.342329219 Simplifying x = -3.342329219

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.842329219, -3.342329219}

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