3(x-4)-7=-2x(x-5)

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Solution for 3(x-4)-7=-2x(x-5) equation:


Simplifying
3(x + -4) + -7 = -2x(x + -5)

Reorder the terms:
3(-4 + x) + -7 = -2x(x + -5)
(-4 * 3 + x * 3) + -7 = -2x(x + -5)
(-12 + 3x) + -7 = -2x(x + -5)

Reorder the terms:
-12 + -7 + 3x = -2x(x + -5)

Combine like terms: -12 + -7 = -19
-19 + 3x = -2x(x + -5)

Reorder the terms:
-19 + 3x = -2x(-5 + x)
-19 + 3x = (-5 * -2x + x * -2x)
-19 + 3x = (10x + -2x2)

Solving
-19 + 3x = 10x + -2x2

Solving for variable 'x'.

Combine like terms: 3x + -10x = -7x
-19 + -7x + 2x2 = 10x + -2x2 + -10x + 2x2

Reorder the terms:
-19 + -7x + 2x2 = 10x + -10x + -2x2 + 2x2

Combine like terms: 10x + -10x = 0
-19 + -7x + 2x2 = 0 + -2x2 + 2x2
-19 + -7x + 2x2 = -2x2 + 2x2

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

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

Divide each side by '2'.
-9.5 + -3.5x + x2 = 0

Move the constant term to the right:

Add '9.5' to each side of the equation.
-9.5 + -3.5x + 9.5 + x2 = 0 + 9.5

Reorder the terms:
-9.5 + 9.5 + -3.5x + x2 = 0 + 9.5

Combine like terms: -9.5 + 9.5 = 0.0
0.0 + -3.5x + x2 = 0 + 9.5
-3.5x + x2 = 0 + 9.5

Combine like terms: 0 + 9.5 = 9.5
-3.5x + x2 = 9.5

The x term is -3.5x.  Take half its coefficient (-1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
-3.5x + 3.0625 + x2 = 9.5 + 3.0625

Reorder the terms:
3.0625 + -3.5x + x2 = 9.5 + 3.0625

Combine like terms: 9.5 + 3.0625 = 12.5625
3.0625 + -3.5x + x2 = 12.5625

Factor a perfect square on the left side:
(x + -1.75)(x + -1.75) = 12.5625

Calculate the square root of the right side: 3.54436172

Break this problem into two subproblems by setting 
(x + -1.75) equal to 3.54436172 and -3.54436172.

Subproblem 1

x + -1.75 = 3.54436172 Simplifying x + -1.75 = 3.54436172 Reorder the terms: -1.75 + x = 3.54436172 Solving -1.75 + x = 3.54436172 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = 3.54436172 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = 3.54436172 + 1.75 x = 3.54436172 + 1.75 Combine like terms: 3.54436172 + 1.75 = 5.29436172 x = 5.29436172 Simplifying x = 5.29436172

Subproblem 2

x + -1.75 = -3.54436172 Simplifying x + -1.75 = -3.54436172 Reorder the terms: -1.75 + x = -3.54436172 Solving -1.75 + x = -3.54436172 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = -3.54436172 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = -3.54436172 + 1.75 x = -3.54436172 + 1.75 Combine like terms: -3.54436172 + 1.75 = -1.79436172 x = -1.79436172 Simplifying x = -1.79436172

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.29436172, -1.79436172}

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