x+x(x-9)=43

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Solution for x+x(x-9)=43 equation:


Simplifying
x + x(x + -9) = 43

Reorder the terms:
x + x(-9 + x) = 43
x + (-9 * x + x * x) = 43
x + (-9x + x2) = 43

Combine like terms: x + -9x = -8x
-8x + x2 = 43

Solving
-8x + x2 = 43

Solving for variable 'x'.

Reorder the terms:
-43 + -8x + x2 = 43 + -43

Combine like terms: 43 + -43 = 0
-43 + -8x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '43' to each side of the equation.
-43 + -8x + 43 + x2 = 0 + 43

Reorder the terms:
-43 + 43 + -8x + x2 = 0 + 43

Combine like terms: -43 + 43 = 0
0 + -8x + x2 = 0 + 43
-8x + x2 = 0 + 43

Combine like terms: 0 + 43 = 43
-8x + x2 = 43

The x term is -8x.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8x + 16 + x2 = 43 + 16

Reorder the terms:
16 + -8x + x2 = 43 + 16

Combine like terms: 43 + 16 = 59
16 + -8x + x2 = 59

Factor a perfect square on the left side:
(x + -4)(x + -4) = 59

Calculate the square root of the right side: 7.681145748

Break this problem into two subproblems by setting 
(x + -4) equal to 7.681145748 and -7.681145748.

Subproblem 1

x + -4 = 7.681145748 Simplifying x + -4 = 7.681145748 Reorder the terms: -4 + x = 7.681145748 Solving -4 + x = 7.681145748 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = 7.681145748 + 4 Combine like terms: -4 + 4 = 0 0 + x = 7.681145748 + 4 x = 7.681145748 + 4 Combine like terms: 7.681145748 + 4 = 11.681145748 x = 11.681145748 Simplifying x = 11.681145748

Subproblem 2

x + -4 = -7.681145748 Simplifying x + -4 = -7.681145748 Reorder the terms: -4 + x = -7.681145748 Solving -4 + x = -7.681145748 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = -7.681145748 + 4 Combine like terms: -4 + 4 = 0 0 + x = -7.681145748 + 4 x = -7.681145748 + 4 Combine like terms: -7.681145748 + 4 = -3.681145748 x = -3.681145748 Simplifying x = -3.681145748

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.681145748, -3.681145748}

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