(x-3)*(x+5)=8

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Solution for (x-3)*(x+5)=8 equation:


Simplifying
(x + -3)(x + 5) = 8

Reorder the terms:
(-3 + x)(x + 5) = 8

Reorder the terms:
(-3 + x)(5 + x) = 8

Multiply (-3 + x) * (5 + x)
(-3(5 + x) + x(5 + x)) = 8
((5 * -3 + x * -3) + x(5 + x)) = 8
((-15 + -3x) + x(5 + x)) = 8
(-15 + -3x + (5 * x + x * x)) = 8
(-15 + -3x + (5x + x2)) = 8

Combine like terms: -3x + 5x = 2x
(-15 + 2x + x2) = 8

Solving
-15 + 2x + x2 = 8

Solving for variable 'x'.

Reorder the terms:
-15 + -8 + 2x + x2 = 8 + -8

Combine like terms: -15 + -8 = -23
-23 + 2x + x2 = 8 + -8

Combine like terms: 8 + -8 = 0
-23 + 2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '23' to each side of the equation.
-23 + 2x + 23 + x2 = 0 + 23

Reorder the terms:
-23 + 23 + 2x + x2 = 0 + 23

Combine like terms: -23 + 23 = 0
0 + 2x + x2 = 0 + 23
2x + x2 = 0 + 23

Combine like terms: 0 + 23 = 23
2x + x2 = 23

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 23 + 1

Reorder the terms:
1 + 2x + x2 = 23 + 1

Combine like terms: 23 + 1 = 24
1 + 2x + x2 = 24

Factor a perfect square on the left side:
(x + 1)(x + 1) = 24

Calculate the square root of the right side: 4.898979486

Break this problem into two subproblems by setting 
(x + 1) equal to 4.898979486 and -4.898979486.

Subproblem 1

x + 1 = 4.898979486 Simplifying x + 1 = 4.898979486 Reorder the terms: 1 + x = 4.898979486 Solving 1 + x = 4.898979486 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 4.898979486 + -1 Combine like terms: 1 + -1 = 0 0 + x = 4.898979486 + -1 x = 4.898979486 + -1 Combine like terms: 4.898979486 + -1 = 3.898979486 x = 3.898979486 Simplifying x = 3.898979486

Subproblem 2

x + 1 = -4.898979486 Simplifying x + 1 = -4.898979486 Reorder the terms: 1 + x = -4.898979486 Solving 1 + x = -4.898979486 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -4.898979486 + -1 Combine like terms: 1 + -1 = 0 0 + x = -4.898979486 + -1 x = -4.898979486 + -1 Combine like terms: -4.898979486 + -1 = -5.898979486 x = -5.898979486 Simplifying x = -5.898979486

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.898979486, -5.898979486}

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