137=7x-5x[-2x+10]

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Solution for 137=7x-5x[-2x+10] equation:


Simplifying
137 = 7x + -5x[-2x + 10]

Reorder the terms:
137 = 7x + -5x[10 + -2x]
137 = 7x + [10 * -5x + -2x * -5x]
137 = 7x + [-50x + 10x2]

Combine like terms: 7x + -50x = -43x
137 = -43x + 10x2

Solving
137 = -43x + 10x2

Solving for variable 'x'.

Reorder the terms:
137 + 43x + -10x2 = -43x + 43x + 10x2 + -10x2

Combine like terms: -43x + 43x = 0
137 + 43x + -10x2 = 0 + 10x2 + -10x2
137 + 43x + -10x2 = 10x2 + -10x2

Combine like terms: 10x2 + -10x2 = 0
137 + 43x + -10x2 = 0

Begin completing the square.  Divide all terms by
-10 the coefficient of the squared term: 

Divide each side by '-10'.
-13.7 + -4.3x + x2 = 0

Move the constant term to the right:

Add '13.7' to each side of the equation.
-13.7 + -4.3x + 13.7 + x2 = 0 + 13.7

Reorder the terms:
-13.7 + 13.7 + -4.3x + x2 = 0 + 13.7

Combine like terms: -13.7 + 13.7 = 0.0
0.0 + -4.3x + x2 = 0 + 13.7
-4.3x + x2 = 0 + 13.7

Combine like terms: 0 + 13.7 = 13.7
-4.3x + x2 = 13.7

The x term is -4.3x.  Take half its coefficient (-2.15).
Square it (4.6225) and add it to both sides.

Add '4.6225' to each side of the equation.
-4.3x + 4.6225 + x2 = 13.7 + 4.6225

Reorder the terms:
4.6225 + -4.3x + x2 = 13.7 + 4.6225

Combine like terms: 13.7 + 4.6225 = 18.3225
4.6225 + -4.3x + x2 = 18.3225

Factor a perfect square on the left side:
(x + -2.15)(x + -2.15) = 18.3225

Calculate the square root of the right side: 4.280478945

Break this problem into two subproblems by setting 
(x + -2.15) equal to 4.280478945 and -4.280478945.

Subproblem 1

x + -2.15 = 4.280478945 Simplifying x + -2.15 = 4.280478945 Reorder the terms: -2.15 + x = 4.280478945 Solving -2.15 + x = 4.280478945 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.15' to each side of the equation. -2.15 + 2.15 + x = 4.280478945 + 2.15 Combine like terms: -2.15 + 2.15 = 0.00 0.00 + x = 4.280478945 + 2.15 x = 4.280478945 + 2.15 Combine like terms: 4.280478945 + 2.15 = 6.430478945 x = 6.430478945 Simplifying x = 6.430478945

Subproblem 2

x + -2.15 = -4.280478945 Simplifying x + -2.15 = -4.280478945 Reorder the terms: -2.15 + x = -4.280478945 Solving -2.15 + x = -4.280478945 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.15' to each side of the equation. -2.15 + 2.15 + x = -4.280478945 + 2.15 Combine like terms: -2.15 + 2.15 = 0.00 0.00 + x = -4.280478945 + 2.15 x = -4.280478945 + 2.15 Combine like terms: -4.280478945 + 2.15 = -2.130478945 x = -2.130478945 Simplifying x = -2.130478945

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.430478945, -2.130478945}

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