x^2+(3x-1)(3x-1)=16

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Solution for x^2+(3x-1)(3x-1)=16 equation:


Simplifying
x2 + (3x + -1)(3x + -1) = 16

Reorder the terms:
x2 + (-1 + 3x)(3x + -1) = 16

Reorder the terms:
x2 + (-1 + 3x)(-1 + 3x) = 16

Multiply (-1 + 3x) * (-1 + 3x)
x2 + (-1(-1 + 3x) + 3x * (-1 + 3x)) = 16
x2 + ((-1 * -1 + 3x * -1) + 3x * (-1 + 3x)) = 16
x2 + ((1 + -3x) + 3x * (-1 + 3x)) = 16
x2 + (1 + -3x + (-1 * 3x + 3x * 3x)) = 16
x2 + (1 + -3x + (-3x + 9x2)) = 16

Combine like terms: -3x + -3x = -6x
x2 + (1 + -6x + 9x2) = 16

Reorder the terms:
1 + -6x + x2 + 9x2 = 16

Combine like terms: x2 + 9x2 = 10x2
1 + -6x + 10x2 = 16

Solving
1 + -6x + 10x2 = 16

Solving for variable 'x'.

Reorder the terms:
1 + -16 + -6x + 10x2 = 16 + -16

Combine like terms: 1 + -16 = -15
-15 + -6x + 10x2 = 16 + -16

Combine like terms: 16 + -16 = 0
-15 + -6x + 10x2 = 0

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

Divide each side by '10'.
-1.5 + -0.6x + x2 = 0.0

Move the constant term to the right:

Add '1.5' to each side of the equation.
-1.5 + -0.6x + 1.5 + x2 = 0.0 + 1.5

Reorder the terms:
-1.5 + 1.5 + -0.6x + x2 = 0.0 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + -0.6x + x2 = 0.0 + 1.5
-0.6x + x2 = 0.0 + 1.5

Combine like terms: 0.0 + 1.5 = 1.5
-0.6x + x2 = 1.5

The x term is -0.6x.  Take half its coefficient (-0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
-0.6x + 0.09 + x2 = 1.5 + 0.09

Reorder the terms:
0.09 + -0.6x + x2 = 1.5 + 0.09

Combine like terms: 1.5 + 0.09 = 1.59
0.09 + -0.6x + x2 = 1.59

Factor a perfect square on the left side:
(x + -0.3)(x + -0.3) = 1.59

Calculate the square root of the right side: 1.260952021

Break this problem into two subproblems by setting 
(x + -0.3) equal to 1.260952021 and -1.260952021.

Subproblem 1

x + -0.3 = 1.260952021 Simplifying x + -0.3 = 1.260952021 Reorder the terms: -0.3 + x = 1.260952021 Solving -0.3 + x = 1.260952021 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3' to each side of the equation. -0.3 + 0.3 + x = 1.260952021 + 0.3 Combine like terms: -0.3 + 0.3 = 0.0 0.0 + x = 1.260952021 + 0.3 x = 1.260952021 + 0.3 Combine like terms: 1.260952021 + 0.3 = 1.560952021 x = 1.560952021 Simplifying x = 1.560952021

Subproblem 2

x + -0.3 = -1.260952021 Simplifying x + -0.3 = -1.260952021 Reorder the terms: -0.3 + x = -1.260952021 Solving -0.3 + x = -1.260952021 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3' to each side of the equation. -0.3 + 0.3 + x = -1.260952021 + 0.3 Combine like terms: -0.3 + 0.3 = 0.0 0.0 + x = -1.260952021 + 0.3 x = -1.260952021 + 0.3 Combine like terms: -1.260952021 + 0.3 = -0.960952021 x = -0.960952021 Simplifying x = -0.960952021

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.560952021, -0.960952021}

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