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

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


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

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

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

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

Combine like terms: -3x + 10x = 7x
(-15 + 7x + 2x2) = 3

Solving
-15 + 7x + 2x2 = 3

Solving for variable 'x'.

Reorder the terms:
-15 + -3 + 7x + 2x2 = 3 + -3

Combine like terms: -15 + -3 = -18
-18 + 7x + 2x2 = 3 + -3

Combine like terms: 3 + -3 = 0
-18 + 7x + 2x2 = 0

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

Divide each side by '2'.
-9 + 3.5x + x2 = 0

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + 3.5x + 9 + x2 = 0 + 9

Reorder the terms:
-9 + 9 + 3.5x + x2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + 3.5x + x2 = 0 + 9
3.5x + x2 = 0 + 9

Combine like terms: 0 + 9 = 9
3.5x + x2 = 9

The x term is 3.5x.  Take half its coefficient (1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
3.5x + 3.0625 + x2 = 9 + 3.0625

Reorder the terms:
3.0625 + 3.5x + x2 = 9 + 3.0625

Combine like terms: 9 + 3.0625 = 12.0625
3.0625 + 3.5x + x2 = 12.0625

Factor a perfect square on the left side:
(x + 1.75)(x + 1.75) = 12.0625

Calculate the square root of the right side: 3.473110997

Break this problem into two subproblems by setting 
(x + 1.75) equal to 3.473110997 and -3.473110997.

Subproblem 1

x + 1.75 = 3.473110997 Simplifying x + 1.75 = 3.473110997 Reorder the terms: 1.75 + x = 3.473110997 Solving 1.75 + x = 3.473110997 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + x = 3.473110997 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + x = 3.473110997 + -1.75 x = 3.473110997 + -1.75 Combine like terms: 3.473110997 + -1.75 = 1.723110997 x = 1.723110997 Simplifying x = 1.723110997

Subproblem 2

x + 1.75 = -3.473110997 Simplifying x + 1.75 = -3.473110997 Reorder the terms: 1.75 + x = -3.473110997 Solving 1.75 + x = -3.473110997 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + x = -3.473110997 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + x = -3.473110997 + -1.75 x = -3.473110997 + -1.75 Combine like terms: -3.473110997 + -1.75 = -5.223110997 x = -5.223110997 Simplifying x = -5.223110997

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.723110997, -5.223110997}

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