(x+10)(x-5)=(x+1)

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Solution for (x+10)(x-5)=(x+1) equation:


Simplifying
(x + 10)(x + -5) = (x + 1)

Reorder the terms:
(10 + x)(x + -5) = (x + 1)

Reorder the terms:
(10 + x)(-5 + x) = (x + 1)

Multiply (10 + x) * (-5 + x)
(10(-5 + x) + x(-5 + x)) = (x + 1)
((-5 * 10 + x * 10) + x(-5 + x)) = (x + 1)
((-50 + 10x) + x(-5 + x)) = (x + 1)
(-50 + 10x + (-5 * x + x * x)) = (x + 1)
(-50 + 10x + (-5x + x2)) = (x + 1)

Combine like terms: 10x + -5x = 5x
(-50 + 5x + x2) = (x + 1)

Reorder the terms:
-50 + 5x + x2 = (1 + x)

Remove parenthesis around (1 + x)
-50 + 5x + x2 = 1 + x

Solving
-50 + 5x + x2 = 1 + x

Solving for variable 'x'.

Reorder the terms:
-50 + -1 + 5x + -1x + x2 = 1 + x + -1 + -1x

Combine like terms: -50 + -1 = -51
-51 + 5x + -1x + x2 = 1 + x + -1 + -1x

Combine like terms: 5x + -1x = 4x
-51 + 4x + x2 = 1 + x + -1 + -1x

Reorder the terms:
-51 + 4x + x2 = 1 + -1 + x + -1x

Combine like terms: 1 + -1 = 0
-51 + 4x + x2 = 0 + x + -1x
-51 + 4x + x2 = x + -1x

Combine like terms: x + -1x = 0
-51 + 4x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '51' to each side of the equation.
-51 + 4x + 51 + x2 = 0 + 51

Reorder the terms:
-51 + 51 + 4x + x2 = 0 + 51

Combine like terms: -51 + 51 = 0
0 + 4x + x2 = 0 + 51
4x + x2 = 0 + 51

Combine like terms: 0 + 51 = 51
4x + x2 = 51

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = 51 + 4

Reorder the terms:
4 + 4x + x2 = 51 + 4

Combine like terms: 51 + 4 = 55
4 + 4x + x2 = 55

Factor a perfect square on the left side:
(x + 2)(x + 2) = 55

Calculate the square root of the right side: 7.416198487

Break this problem into two subproblems by setting 
(x + 2) equal to 7.416198487 and -7.416198487.

Subproblem 1

x + 2 = 7.416198487 Simplifying x + 2 = 7.416198487 Reorder the terms: 2 + x = 7.416198487 Solving 2 + x = 7.416198487 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 7.416198487 + -2 Combine like terms: 2 + -2 = 0 0 + x = 7.416198487 + -2 x = 7.416198487 + -2 Combine like terms: 7.416198487 + -2 = 5.416198487 x = 5.416198487 Simplifying x = 5.416198487

Subproblem 2

x + 2 = -7.416198487 Simplifying x + 2 = -7.416198487 Reorder the terms: 2 + x = -7.416198487 Solving 2 + x = -7.416198487 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -7.416198487 + -2 Combine like terms: 2 + -2 = 0 0 + x = -7.416198487 + -2 x = -7.416198487 + -2 Combine like terms: -7.416198487 + -2 = -9.416198487 x = -9.416198487 Simplifying x = -9.416198487

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.416198487, -9.416198487}

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