(2x-7)(x+3)=3

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


Simplifying
(2x + -7)(x + 3) = 3

Reorder the terms:
(-7 + 2x)(x + 3) = 3

Reorder the terms:
(-7 + 2x)(3 + x) = 3

Multiply (-7 + 2x) * (3 + x)
(-7(3 + x) + 2x * (3 + x)) = 3
((3 * -7 + x * -7) + 2x * (3 + x)) = 3
((-21 + -7x) + 2x * (3 + x)) = 3
(-21 + -7x + (3 * 2x + x * 2x)) = 3
(-21 + -7x + (6x + 2x2)) = 3

Combine like terms: -7x + 6x = -1x
(-21 + -1x + 2x2) = 3

Solving
-21 + -1x + 2x2 = 3

Solving for variable 'x'.

Reorder the terms:
-21 + -3 + -1x + 2x2 = 3 + -3

Combine like terms: -21 + -3 = -24
-24 + -1x + 2x2 = 3 + -3

Combine like terms: 3 + -3 = 0
-24 + -1x + 2x2 = 0

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

Divide each side by '2'.
-12 + -0.5x + x2 = 0

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + -0.5x + 12 + x2 = 0 + 12

Reorder the terms:
-12 + 12 + -0.5x + x2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + -0.5x + x2 = 0 + 12
-0.5x + x2 = 0 + 12

Combine like terms: 0 + 12 = 12
-0.5x + x2 = 12

The x term is -0.5x.  Take half its coefficient (-0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
-0.5x + 0.0625 + x2 = 12 + 0.0625

Reorder the terms:
0.0625 + -0.5x + x2 = 12 + 0.0625

Combine like terms: 12 + 0.0625 = 12.0625
0.0625 + -0.5x + x2 = 12.0625

Factor a perfect square on the left side:
(x + -0.25)(x + -0.25) = 12.0625

Calculate the square root of the right side: 3.473110997

Break this problem into two subproblems by setting 
(x + -0.25) equal to 3.473110997 and -3.473110997.

Subproblem 1

x + -0.25 = 3.473110997 Simplifying x + -0.25 = 3.473110997 Reorder the terms: -0.25 + x = 3.473110997 Solving -0.25 + x = 3.473110997 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x = 3.473110997 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = 3.473110997 + 0.25 x = 3.473110997 + 0.25 Combine like terms: 3.473110997 + 0.25 = 3.723110997 x = 3.723110997 Simplifying x = 3.723110997

Subproblem 2

x + -0.25 = -3.473110997 Simplifying x + -0.25 = -3.473110997 Reorder the terms: -0.25 + x = -3.473110997 Solving -0.25 + x = -3.473110997 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x = -3.473110997 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = -3.473110997 + 0.25 x = -3.473110997 + 0.25 Combine like terms: -3.473110997 + 0.25 = -3.223110997 x = -3.223110997 Simplifying x = -3.223110997

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.723110997, -3.223110997}

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