(3x-2)(x+5)=(4+x^2)

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


Simplifying
(3x + -2)(x + 5) = (4 + x2)

Reorder the terms:
(-2 + 3x)(x + 5) = (4 + x2)

Reorder the terms:
(-2 + 3x)(5 + x) = (4 + x2)

Multiply (-2 + 3x) * (5 + x)
(-2(5 + x) + 3x * (5 + x)) = (4 + x2)
((5 * -2 + x * -2) + 3x * (5 + x)) = (4 + x2)
((-10 + -2x) + 3x * (5 + x)) = (4 + x2)
(-10 + -2x + (5 * 3x + x * 3x)) = (4 + x2)
(-10 + -2x + (15x + 3x2)) = (4 + x2)

Combine like terms: -2x + 15x = 13x
(-10 + 13x + 3x2) = (4 + x2)

Remove parenthesis around (4 + x2)
-10 + 13x + 3x2 = 4 + x2

Solving
-10 + 13x + 3x2 = 4 + x2

Solving for variable 'x'.

Reorder the terms:
-10 + -4 + 13x + 3x2 + -1x2 = 4 + x2 + -4 + -1x2

Combine like terms: -10 + -4 = -14
-14 + 13x + 3x2 + -1x2 = 4 + x2 + -4 + -1x2

Combine like terms: 3x2 + -1x2 = 2x2
-14 + 13x + 2x2 = 4 + x2 + -4 + -1x2

Reorder the terms:
-14 + 13x + 2x2 = 4 + -4 + x2 + -1x2

Combine like terms: 4 + -4 = 0
-14 + 13x + 2x2 = 0 + x2 + -1x2
-14 + 13x + 2x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-14 + 13x + 2x2 = 0

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

Divide each side by '2'.
-7 + 6.5x + x2 = 0

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + 6.5x + 7 + x2 = 0 + 7

Reorder the terms:
-7 + 7 + 6.5x + x2 = 0 + 7

Combine like terms: -7 + 7 = 0
0 + 6.5x + x2 = 0 + 7
6.5x + x2 = 0 + 7

Combine like terms: 0 + 7 = 7
6.5x + x2 = 7

The x term is 6.5x.  Take half its coefficient (3.25).
Square it (10.5625) and add it to both sides.

Add '10.5625' to each side of the equation.
6.5x + 10.5625 + x2 = 7 + 10.5625

Reorder the terms:
10.5625 + 6.5x + x2 = 7 + 10.5625

Combine like terms: 7 + 10.5625 = 17.5625
10.5625 + 6.5x + x2 = 17.5625

Factor a perfect square on the left side:
(x + 3.25)(x + 3.25) = 17.5625

Calculate the square root of the right side: 4.190763654

Break this problem into two subproblems by setting 
(x + 3.25) equal to 4.190763654 and -4.190763654.

Subproblem 1

x + 3.25 = 4.190763654 Simplifying x + 3.25 = 4.190763654 Reorder the terms: 3.25 + x = 4.190763654 Solving 3.25 + x = 4.190763654 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.25' to each side of the equation. 3.25 + -3.25 + x = 4.190763654 + -3.25 Combine like terms: 3.25 + -3.25 = 0.00 0.00 + x = 4.190763654 + -3.25 x = 4.190763654 + -3.25 Combine like terms: 4.190763654 + -3.25 = 0.940763654 x = 0.940763654 Simplifying x = 0.940763654

Subproblem 2

x + 3.25 = -4.190763654 Simplifying x + 3.25 = -4.190763654 Reorder the terms: 3.25 + x = -4.190763654 Solving 3.25 + x = -4.190763654 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.25' to each side of the equation. 3.25 + -3.25 + x = -4.190763654 + -3.25 Combine like terms: 3.25 + -3.25 = 0.00 0.00 + x = -4.190763654 + -3.25 x = -4.190763654 + -3.25 Combine like terms: -4.190763654 + -3.25 = -7.440763654 x = -7.440763654 Simplifying x = -7.440763654

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.940763654, -7.440763654}

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