(x-3)(x+5)=10

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Solution for (x-3)(x+5)=10 equation:


Simplifying
(x + -3)(x + 5) = 10

Reorder the terms:
(-3 + x)(x + 5) = 10

Reorder the terms:
(-3 + x)(5 + x) = 10

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

Combine like terms: -3x + 5x = 2x
(-15 + 2x + x2) = 10

Solving
-15 + 2x + x2 = 10

Solving for variable 'x'.

Reorder the terms:
-15 + -10 + 2x + x2 = 10 + -10

Combine like terms: -15 + -10 = -25
-25 + 2x + x2 = 10 + -10

Combine like terms: 10 + -10 = 0
-25 + 2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '25' to each side of the equation.
-25 + 2x + 25 + x2 = 0 + 25

Reorder the terms:
-25 + 25 + 2x + x2 = 0 + 25

Combine like terms: -25 + 25 = 0
0 + 2x + x2 = 0 + 25
2x + x2 = 0 + 25

Combine like terms: 0 + 25 = 25
2x + x2 = 25

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 = 25 + 1

Reorder the terms:
1 + 2x + x2 = 25 + 1

Combine like terms: 25 + 1 = 26
1 + 2x + x2 = 26

Factor a perfect square on the left side:
(x + 1)(x + 1) = 26

Calculate the square root of the right side: 5.099019514

Break this problem into two subproblems by setting 
(x + 1) equal to 5.099019514 and -5.099019514.

Subproblem 1

x + 1 = 5.099019514 Simplifying x + 1 = 5.099019514 Reorder the terms: 1 + x = 5.099019514 Solving 1 + x = 5.099019514 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 = 5.099019514 + -1 Combine like terms: 1 + -1 = 0 0 + x = 5.099019514 + -1 x = 5.099019514 + -1 Combine like terms: 5.099019514 + -1 = 4.099019514 x = 4.099019514 Simplifying x = 4.099019514

Subproblem 2

x + 1 = -5.099019514 Simplifying x + 1 = -5.099019514 Reorder the terms: 1 + x = -5.099019514 Solving 1 + x = -5.099019514 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 = -5.099019514 + -1 Combine like terms: 1 + -1 = 0 0 + x = -5.099019514 + -1 x = -5.099019514 + -1 Combine like terms: -5.099019514 + -1 = -6.099019514 x = -6.099019514 Simplifying x = -6.099019514

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.099019514, -6.099019514}

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