3x(2x)-5x(7-2x)=10-4x+5

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Solution for 3x(2x)-5x(7-2x)=10-4x+5 equation:


Simplifying
3x(2x) + -5x(7 + -2x) = 10 + -4x + 5

Remove parenthesis around (2x)
3x * 2x + -5x(7 + -2x) = 10 + -4x + 5

Reorder the terms for easier multiplication:
3 * 2x * x + -5x(7 + -2x) = 10 + -4x + 5

Multiply 3 * 2
6x * x + -5x(7 + -2x) = 10 + -4x + 5

Multiply x * x
6x2 + -5x(7 + -2x) = 10 + -4x + 5
6x2 + (7 * -5x + -2x * -5x) = 10 + -4x + 5
6x2 + (-35x + 10x2) = 10 + -4x + 5

Reorder the terms:
-35x + 6x2 + 10x2 = 10 + -4x + 5

Combine like terms: 6x2 + 10x2 = 16x2
-35x + 16x2 = 10 + -4x + 5

Reorder the terms:
-35x + 16x2 = 10 + 5 + -4x

Combine like terms: 10 + 5 = 15
-35x + 16x2 = 15 + -4x

Solving
-35x + 16x2 = 15 + -4x

Solving for variable 'x'.

Reorder the terms:
-15 + -35x + 4x + 16x2 = 15 + -4x + -15 + 4x

Combine like terms: -35x + 4x = -31x
-15 + -31x + 16x2 = 15 + -4x + -15 + 4x

Reorder the terms:
-15 + -31x + 16x2 = 15 + -15 + -4x + 4x

Combine like terms: 15 + -15 = 0
-15 + -31x + 16x2 = 0 + -4x + 4x
-15 + -31x + 16x2 = -4x + 4x

Combine like terms: -4x + 4x = 0
-15 + -31x + 16x2 = 0

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

Divide each side by '16'.
-0.9375 + -1.9375x + x2 = 0

Move the constant term to the right:

Add '0.9375' to each side of the equation.
-0.9375 + -1.9375x + 0.9375 + x2 = 0 + 0.9375

Reorder the terms:
-0.9375 + 0.9375 + -1.9375x + x2 = 0 + 0.9375

Combine like terms: -0.9375 + 0.9375 = 0.0000
0.0000 + -1.9375x + x2 = 0 + 0.9375
-1.9375x + x2 = 0 + 0.9375

Combine like terms: 0 + 0.9375 = 0.9375
-1.9375x + x2 = 0.9375

The x term is -1.9375x.  Take half its coefficient (-0.96875).
Square it (0.9384765625) and add it to both sides.

Add '0.9384765625' to each side of the equation.
-1.9375x + 0.9384765625 + x2 = 0.9375 + 0.9384765625

Reorder the terms:
0.9384765625 + -1.9375x + x2 = 0.9375 + 0.9384765625

Combine like terms: 0.9375 + 0.9384765625 = 1.8759765625
0.9384765625 + -1.9375x + x2 = 1.8759765625

Factor a perfect square on the left side:
(x + -0.96875)(x + -0.96875) = 1.8759765625

Calculate the square root of the right side: 1.369662938

Break this problem into two subproblems by setting 
(x + -0.96875) equal to 1.369662938 and -1.369662938.

Subproblem 1

x + -0.96875 = 1.369662938 Simplifying x + -0.96875 = 1.369662938 Reorder the terms: -0.96875 + x = 1.369662938 Solving -0.96875 + x = 1.369662938 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.96875' to each side of the equation. -0.96875 + 0.96875 + x = 1.369662938 + 0.96875 Combine like terms: -0.96875 + 0.96875 = 0.00000 0.00000 + x = 1.369662938 + 0.96875 x = 1.369662938 + 0.96875 Combine like terms: 1.369662938 + 0.96875 = 2.338412938 x = 2.338412938 Simplifying x = 2.338412938

Subproblem 2

x + -0.96875 = -1.369662938 Simplifying x + -0.96875 = -1.369662938 Reorder the terms: -0.96875 + x = -1.369662938 Solving -0.96875 + x = -1.369662938 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.96875' to each side of the equation. -0.96875 + 0.96875 + x = -1.369662938 + 0.96875 Combine like terms: -0.96875 + 0.96875 = 0.00000 0.00000 + x = -1.369662938 + 0.96875 x = -1.369662938 + 0.96875 Combine like terms: -1.369662938 + 0.96875 = -0.400912938 x = -0.400912938 Simplifying x = -0.400912938

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.338412938, -0.400912938}

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