(3x+1)(3-x)=4x^2+19

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Solution for (3x+1)(3-x)=4x^2+19 equation:


Simplifying
(3x + 1)(3 + -1x) = 4x2 + 19

Reorder the terms:
(1 + 3x)(3 + -1x) = 4x2 + 19

Multiply (1 + 3x) * (3 + -1x)
(1(3 + -1x) + 3x * (3 + -1x)) = 4x2 + 19
((3 * 1 + -1x * 1) + 3x * (3 + -1x)) = 4x2 + 19
((3 + -1x) + 3x * (3 + -1x)) = 4x2 + 19
(3 + -1x + (3 * 3x + -1x * 3x)) = 4x2 + 19
(3 + -1x + (9x + -3x2)) = 4x2 + 19

Combine like terms: -1x + 9x = 8x
(3 + 8x + -3x2) = 4x2 + 19

Reorder the terms:
3 + 8x + -3x2 = 19 + 4x2

Solving
3 + 8x + -3x2 = 19 + 4x2

Solving for variable 'x'.

Reorder the terms:
3 + -19 + 8x + -3x2 + -4x2 = 19 + 4x2 + -19 + -4x2

Combine like terms: 3 + -19 = -16
-16 + 8x + -3x2 + -4x2 = 19 + 4x2 + -19 + -4x2

Combine like terms: -3x2 + -4x2 = -7x2
-16 + 8x + -7x2 = 19 + 4x2 + -19 + -4x2

Reorder the terms:
-16 + 8x + -7x2 = 19 + -19 + 4x2 + -4x2

Combine like terms: 19 + -19 = 0
-16 + 8x + -7x2 = 0 + 4x2 + -4x2
-16 + 8x + -7x2 = 4x2 + -4x2

Combine like terms: 4x2 + -4x2 = 0
-16 + 8x + -7x2 = 0

Begin completing the square.  Divide all terms by
-7 the coefficient of the squared term: 

Divide each side by '-7'.
2.285714286 + -1.142857143x + x2 = 0

Move the constant term to the right:

Add '-2.285714286' to each side of the equation.
2.285714286 + -1.142857143x + -2.285714286 + x2 = 0 + -2.285714286

Reorder the terms:
2.285714286 + -2.285714286 + -1.142857143x + x2 = 0 + -2.285714286

Combine like terms: 2.285714286 + -2.285714286 = 0.000000000
0.000000000 + -1.142857143x + x2 = 0 + -2.285714286
-1.142857143x + x2 = 0 + -2.285714286

Combine like terms: 0 + -2.285714286 = -2.285714286
-1.142857143x + x2 = -2.285714286

The x term is -1.142857143x.  Take half its coefficient (-0.5714285715).
Square it (0.3265306123) and add it to both sides.

Add '0.3265306123' to each side of the equation.
-1.142857143x + 0.3265306123 + x2 = -2.285714286 + 0.3265306123

Reorder the terms:
0.3265306123 + -1.142857143x + x2 = -2.285714286 + 0.3265306123

Combine like terms: -2.285714286 + 0.3265306123 = -1.9591836737
0.3265306123 + -1.142857143x + x2 = -1.9591836737

Factor a perfect square on the left side:
(x + -0.5714285715)(x + -0.5714285715) = -1.9591836737

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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