(x-3)(x+6)=x-7

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Solution for (x-3)(x+6)=x-7 equation:


Simplifying
(x + -3)(x + 6) = x + -7

Reorder the terms:
(-3 + x)(x + 6) = x + -7

Reorder the terms:
(-3 + x)(6 + x) = x + -7

Multiply (-3 + x) * (6 + x)
(-3(6 + x) + x(6 + x)) = x + -7
((6 * -3 + x * -3) + x(6 + x)) = x + -7
((-18 + -3x) + x(6 + x)) = x + -7
(-18 + -3x + (6 * x + x * x)) = x + -7
(-18 + -3x + (6x + x2)) = x + -7

Combine like terms: -3x + 6x = 3x
(-18 + 3x + x2) = x + -7

Reorder the terms:
-18 + 3x + x2 = -7 + x

Solving
-18 + 3x + x2 = -7 + x

Solving for variable 'x'.

Reorder the terms:
-18 + 7 + 3x + -1x + x2 = -7 + x + 7 + -1x

Combine like terms: -18 + 7 = -11
-11 + 3x + -1x + x2 = -7 + x + 7 + -1x

Combine like terms: 3x + -1x = 2x
-11 + 2x + x2 = -7 + x + 7 + -1x

Reorder the terms:
-11 + 2x + x2 = -7 + 7 + x + -1x

Combine like terms: -7 + 7 = 0
-11 + 2x + x2 = 0 + x + -1x
-11 + 2x + x2 = x + -1x

Combine like terms: x + -1x = 0
-11 + 2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '11' to each side of the equation.
-11 + 2x + 11 + x2 = 0 + 11

Reorder the terms:
-11 + 11 + 2x + x2 = 0 + 11

Combine like terms: -11 + 11 = 0
0 + 2x + x2 = 0 + 11
2x + x2 = 0 + 11

Combine like terms: 0 + 11 = 11
2x + x2 = 11

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 = 11 + 1

Reorder the terms:
1 + 2x + x2 = 11 + 1

Combine like terms: 11 + 1 = 12
1 + 2x + x2 = 12

Factor a perfect square on the left side:
(x + 1)(x + 1) = 12

Calculate the square root of the right side: 3.464101615

Break this problem into two subproblems by setting 
(x + 1) equal to 3.464101615 and -3.464101615.

Subproblem 1

x + 1 = 3.464101615 Simplifying x + 1 = 3.464101615 Reorder the terms: 1 + x = 3.464101615 Solving 1 + x = 3.464101615 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 = 3.464101615 + -1 Combine like terms: 1 + -1 = 0 0 + x = 3.464101615 + -1 x = 3.464101615 + -1 Combine like terms: 3.464101615 + -1 = 2.464101615 x = 2.464101615 Simplifying x = 2.464101615

Subproblem 2

x + 1 = -3.464101615 Simplifying x + 1 = -3.464101615 Reorder the terms: 1 + x = -3.464101615 Solving 1 + x = -3.464101615 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 = -3.464101615 + -1 Combine like terms: 1 + -1 = 0 0 + x = -3.464101615 + -1 x = -3.464101615 + -1 Combine like terms: -3.464101615 + -1 = -4.464101615 x = -4.464101615 Simplifying x = -4.464101615

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.464101615, -4.464101615}

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