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

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


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

Reorder the terms:
3x + 4x(-2 + x) = 7 + x
3x + (-2 * 4x + x * 4x) = 7 + x
3x + (-8x + 4x2) = 7 + x

Combine like terms: 3x + -8x = -5x
-5x + 4x2 = 7 + x

Solving
-5x + 4x2 = 7 + x

Solving for variable 'x'.

Reorder the terms:
-7 + -5x + -1x + 4x2 = 7 + x + -7 + -1x

Combine like terms: -5x + -1x = -6x
-7 + -6x + 4x2 = 7 + x + -7 + -1x

Reorder the terms:
-7 + -6x + 4x2 = 7 + -7 + x + -1x

Combine like terms: 7 + -7 = 0
-7 + -6x + 4x2 = 0 + x + -1x
-7 + -6x + 4x2 = x + -1x

Combine like terms: x + -1x = 0
-7 + -6x + 4x2 = 0

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

Divide each side by '4'.
-1.75 + -1.5x + x2 = 0

Move the constant term to the right:

Add '1.75' to each side of the equation.
-1.75 + -1.5x + 1.75 + x2 = 0 + 1.75

Reorder the terms:
-1.75 + 1.75 + -1.5x + x2 = 0 + 1.75

Combine like terms: -1.75 + 1.75 = 0.00
0.00 + -1.5x + x2 = 0 + 1.75
-1.5x + x2 = 0 + 1.75

Combine like terms: 0 + 1.75 = 1.75
-1.5x + x2 = 1.75

The x term is -1.5x.  Take half its coefficient (-0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
-1.5x + 0.5625 + x2 = 1.75 + 0.5625

Reorder the terms:
0.5625 + -1.5x + x2 = 1.75 + 0.5625

Combine like terms: 1.75 + 0.5625 = 2.3125
0.5625 + -1.5x + x2 = 2.3125

Factor a perfect square on the left side:
(x + -0.75)(x + -0.75) = 2.3125

Calculate the square root of the right side: 1.520690633

Break this problem into two subproblems by setting 
(x + -0.75) equal to 1.520690633 and -1.520690633.

Subproblem 1

x + -0.75 = 1.520690633 Simplifying x + -0.75 = 1.520690633 Reorder the terms: -0.75 + x = 1.520690633 Solving -0.75 + x = 1.520690633 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + x = 1.520690633 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = 1.520690633 + 0.75 x = 1.520690633 + 0.75 Combine like terms: 1.520690633 + 0.75 = 2.270690633 x = 2.270690633 Simplifying x = 2.270690633

Subproblem 2

x + -0.75 = -1.520690633 Simplifying x + -0.75 = -1.520690633 Reorder the terms: -0.75 + x = -1.520690633 Solving -0.75 + x = -1.520690633 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + x = -1.520690633 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = -1.520690633 + 0.75 x = -1.520690633 + 0.75 Combine like terms: -1.520690633 + 0.75 = -0.770690633 x = -0.770690633 Simplifying x = -0.770690633

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.270690633, -0.770690633}

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