3x-40+7x*5x-20+4=40+5x*2x-8

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Solution for 3x-40+7x*5x-20+4=40+5x*2x-8 equation:


Simplifying
3x + -40 + 7x * 5x + -20 + 4 = 40 + 5x * 2x + -8

Reorder the terms for easier multiplication:
3x + -40 + 7 * 5x * x + -20 + 4 = 40 + 5x * 2x + -8

Multiply 7 * 5
3x + -40 + 35x * x + -20 + 4 = 40 + 5x * 2x + -8

Multiply x * x
3x + -40 + 35x2 + -20 + 4 = 40 + 5x * 2x + -8

Reorder the terms:
-40 + -20 + 4 + 3x + 35x2 = 40 + 5x * 2x + -8

Combine like terms: -40 + -20 = -60
-60 + 4 + 3x + 35x2 = 40 + 5x * 2x + -8

Combine like terms: -60 + 4 = -56
-56 + 3x + 35x2 = 40 + 5x * 2x + -8

Reorder the terms for easier multiplication:
-56 + 3x + 35x2 = 40 + 5 * 2x * x + -8

Multiply 5 * 2
-56 + 3x + 35x2 = 40 + 10x * x + -8

Multiply x * x
-56 + 3x + 35x2 = 40 + 10x2 + -8

Reorder the terms:
-56 + 3x + 35x2 = 40 + -8 + 10x2

Combine like terms: 40 + -8 = 32
-56 + 3x + 35x2 = 32 + 10x2

Solving
-56 + 3x + 35x2 = 32 + 10x2

Solving for variable 'x'.

Reorder the terms:
-56 + -32 + 3x + 35x2 + -10x2 = 32 + 10x2 + -32 + -10x2

Combine like terms: -56 + -32 = -88
-88 + 3x + 35x2 + -10x2 = 32 + 10x2 + -32 + -10x2

Combine like terms: 35x2 + -10x2 = 25x2
-88 + 3x + 25x2 = 32 + 10x2 + -32 + -10x2

Reorder the terms:
-88 + 3x + 25x2 = 32 + -32 + 10x2 + -10x2

Combine like terms: 32 + -32 = 0
-88 + 3x + 25x2 = 0 + 10x2 + -10x2
-88 + 3x + 25x2 = 10x2 + -10x2

Combine like terms: 10x2 + -10x2 = 0
-88 + 3x + 25x2 = 0

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

Divide each side by '25'.
-3.52 + 0.12x + x2 = 0

Move the constant term to the right:

Add '3.52' to each side of the equation.
-3.52 + 0.12x + 3.52 + x2 = 0 + 3.52

Reorder the terms:
-3.52 + 3.52 + 0.12x + x2 = 0 + 3.52

Combine like terms: -3.52 + 3.52 = 0.00
0.00 + 0.12x + x2 = 0 + 3.52
0.12x + x2 = 0 + 3.52

Combine like terms: 0 + 3.52 = 3.52
0.12x + x2 = 3.52

The x term is 0.12x.  Take half its coefficient (0.06).
Square it (0.0036) and add it to both sides.

Add '0.0036' to each side of the equation.
0.12x + 0.0036 + x2 = 3.52 + 0.0036

Reorder the terms:
0.0036 + 0.12x + x2 = 3.52 + 0.0036

Combine like terms: 3.52 + 0.0036 = 3.5236
0.0036 + 0.12x + x2 = 3.5236

Factor a perfect square on the left side:
(x + 0.06)(x + 0.06) = 3.5236

Calculate the square root of the right side: 1.877125462

Break this problem into two subproblems by setting 
(x + 0.06) equal to 1.877125462 and -1.877125462.

Subproblem 1

x + 0.06 = 1.877125462 Simplifying x + 0.06 = 1.877125462 Reorder the terms: 0.06 + x = 1.877125462 Solving 0.06 + x = 1.877125462 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.06' to each side of the equation. 0.06 + -0.06 + x = 1.877125462 + -0.06 Combine like terms: 0.06 + -0.06 = 0.00 0.00 + x = 1.877125462 + -0.06 x = 1.877125462 + -0.06 Combine like terms: 1.877125462 + -0.06 = 1.817125462 x = 1.817125462 Simplifying x = 1.817125462

Subproblem 2

x + 0.06 = -1.877125462 Simplifying x + 0.06 = -1.877125462 Reorder the terms: 0.06 + x = -1.877125462 Solving 0.06 + x = -1.877125462 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.06' to each side of the equation. 0.06 + -0.06 + x = -1.877125462 + -0.06 Combine like terms: 0.06 + -0.06 = 0.00 0.00 + x = -1.877125462 + -0.06 x = -1.877125462 + -0.06 Combine like terms: -1.877125462 + -0.06 = -1.937125462 x = -1.937125462 Simplifying x = -1.937125462

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.817125462, -1.937125462}

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