2x(x-3)=43

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Solution for 2x(x-3)=43 equation:


Simplifying
2x(x + -3) = 43

Reorder the terms:
2x(-3 + x) = 43
(-3 * 2x + x * 2x) = 43
(-6x + 2x2) = 43

Solving
-6x + 2x2 = 43

Solving for variable 'x'.

Reorder the terms:
-43 + -6x + 2x2 = 43 + -43

Combine like terms: 43 + -43 = 0
-43 + -6x + 2x2 = 0

Begin completing the square.  Divide all terms by
2 the coefficient of the squared term: 

Divide each side by '2'.
-21.5 + -3x + x2 = 0

Move the constant term to the right:

Add '21.5' to each side of the equation.
-21.5 + -3x + 21.5 + x2 = 0 + 21.5

Reorder the terms:
-21.5 + 21.5 + -3x + x2 = 0 + 21.5

Combine like terms: -21.5 + 21.5 = 0.0
0.0 + -3x + x2 = 0 + 21.5
-3x + x2 = 0 + 21.5

Combine like terms: 0 + 21.5 = 21.5
-3x + x2 = 21.5

The x term is -3x.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3x + 2.25 + x2 = 21.5 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 21.5 + 2.25

Combine like terms: 21.5 + 2.25 = 23.75
2.25 + -3x + x2 = 23.75

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 23.75

Calculate the square root of the right side: 4.873397172

Break this problem into two subproblems by setting 
(x + -1.5) equal to 4.873397172 and -4.873397172.

Subproblem 1

x + -1.5 = 4.873397172 Simplifying x + -1.5 = 4.873397172 Reorder the terms: -1.5 + x = 4.873397172 Solving -1.5 + x = 4.873397172 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = 4.873397172 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 4.873397172 + 1.5 x = 4.873397172 + 1.5 Combine like terms: 4.873397172 + 1.5 = 6.373397172 x = 6.373397172 Simplifying x = 6.373397172

Subproblem 2

x + -1.5 = -4.873397172 Simplifying x + -1.5 = -4.873397172 Reorder the terms: -1.5 + x = -4.873397172 Solving -1.5 + x = -4.873397172 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = -4.873397172 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -4.873397172 + 1.5 x = -4.873397172 + 1.5 Combine like terms: -4.873397172 + 1.5 = -3.373397172 x = -3.373397172 Simplifying x = -3.373397172

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.373397172, -3.373397172}

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