x(x-3)=(x+x)+5x+7

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Solution for x(x-3)=(x+x)+5x+7 equation:


Simplifying
x(x + -3) = (x + x) + 5x + 7

Reorder the terms:
x(-3 + x) = (x + x) + 5x + 7
(-3 * x + x * x) = (x + x) + 5x + 7
(-3x + x2) = (x + x) + 5x + 7

Combine like terms: x + x = 2x
-3x + x2 = (2x) + 5x + 7
-3x + x2 = (2x) + 5x + 7

Reorder the terms:
-3x + x2 = 7 + (2x) + 5x

Combine like terms: (2x) + 5x = 7x
-3x + x2 = 7 + 7x

Solving
-3x + x2 = 7 + 7x

Solving for variable 'x'.

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

Combine like terms: -3x + -7x = -10x
-7 + -10x + x2 = 7 + 7x + -7 + -7x

Reorder the terms:
-7 + -10x + x2 = 7 + -7 + 7x + -7x

Combine like terms: 7 + -7 = 0
-7 + -10x + x2 = 0 + 7x + -7x
-7 + -10x + x2 = 7x + -7x

Combine like terms: 7x + -7x = 0
-7 + -10x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + -10x + 7 + x2 = 0 + 7

Reorder the terms:
-7 + 7 + -10x + x2 = 0 + 7

Combine like terms: -7 + 7 = 0
0 + -10x + x2 = 0 + 7
-10x + x2 = 0 + 7

Combine like terms: 0 + 7 = 7
-10x + x2 = 7

The x term is -10x.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10x + 25 + x2 = 7 + 25

Reorder the terms:
25 + -10x + x2 = 7 + 25

Combine like terms: 7 + 25 = 32
25 + -10x + x2 = 32

Factor a perfect square on the left side:
(x + -5)(x + -5) = 32

Calculate the square root of the right side: 5.656854249

Break this problem into two subproblems by setting 
(x + -5) equal to 5.656854249 and -5.656854249.

Subproblem 1

x + -5 = 5.656854249 Simplifying x + -5 = 5.656854249 Reorder the terms: -5 + x = 5.656854249 Solving -5 + x = 5.656854249 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = 5.656854249 + 5 Combine like terms: -5 + 5 = 0 0 + x = 5.656854249 + 5 x = 5.656854249 + 5 Combine like terms: 5.656854249 + 5 = 10.656854249 x = 10.656854249 Simplifying x = 10.656854249

Subproblem 2

x + -5 = -5.656854249 Simplifying x + -5 = -5.656854249 Reorder the terms: -5 + x = -5.656854249 Solving -5 + x = -5.656854249 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = -5.656854249 + 5 Combine like terms: -5 + 5 = 0 0 + x = -5.656854249 + 5 x = -5.656854249 + 5 Combine like terms: -5.656854249 + 5 = -0.656854249 x = -0.656854249 Simplifying x = -0.656854249

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.656854249, -0.656854249}

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