5x(x-3)=2x+1

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Solution for 5x(x-3)=2x+1 equation:


Simplifying
5x(x + -3) = 2x + 1

Reorder the terms:
5x(-3 + x) = 2x + 1
(-3 * 5x + x * 5x) = 2x + 1
(-15x + 5x2) = 2x + 1

Reorder the terms:
-15x + 5x2 = 1 + 2x

Solving
-15x + 5x2 = 1 + 2x

Solving for variable 'x'.

Reorder the terms:
-1 + -15x + -2x + 5x2 = 1 + 2x + -1 + -2x

Combine like terms: -15x + -2x = -17x
-1 + -17x + 5x2 = 1 + 2x + -1 + -2x

Reorder the terms:
-1 + -17x + 5x2 = 1 + -1 + 2x + -2x

Combine like terms: 1 + -1 = 0
-1 + -17x + 5x2 = 0 + 2x + -2x
-1 + -17x + 5x2 = 2x + -2x

Combine like terms: 2x + -2x = 0
-1 + -17x + 5x2 = 0

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

Divide each side by '5'.
-0.2 + -3.4x + x2 = 0

Move the constant term to the right:

Add '0.2' to each side of the equation.
-0.2 + -3.4x + 0.2 + x2 = 0 + 0.2

Reorder the terms:
-0.2 + 0.2 + -3.4x + x2 = 0 + 0.2

Combine like terms: -0.2 + 0.2 = 0.0
0.0 + -3.4x + x2 = 0 + 0.2
-3.4x + x2 = 0 + 0.2

Combine like terms: 0 + 0.2 = 0.2
-3.4x + x2 = 0.2

The x term is -3.4x.  Take half its coefficient (-1.7).
Square it (2.89) and add it to both sides.

Add '2.89' to each side of the equation.
-3.4x + 2.89 + x2 = 0.2 + 2.89

Reorder the terms:
2.89 + -3.4x + x2 = 0.2 + 2.89

Combine like terms: 0.2 + 2.89 = 3.09
2.89 + -3.4x + x2 = 3.09

Factor a perfect square on the left side:
(x + -1.7)(x + -1.7) = 3.09

Calculate the square root of the right side: 1.757839583

Break this problem into two subproblems by setting 
(x + -1.7) equal to 1.757839583 and -1.757839583.

Subproblem 1

x + -1.7 = 1.757839583 Simplifying x + -1.7 = 1.757839583 Reorder the terms: -1.7 + x = 1.757839583 Solving -1.7 + x = 1.757839583 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.7' to each side of the equation. -1.7 + 1.7 + x = 1.757839583 + 1.7 Combine like terms: -1.7 + 1.7 = 0.0 0.0 + x = 1.757839583 + 1.7 x = 1.757839583 + 1.7 Combine like terms: 1.757839583 + 1.7 = 3.457839583 x = 3.457839583 Simplifying x = 3.457839583

Subproblem 2

x + -1.7 = -1.757839583 Simplifying x + -1.7 = -1.757839583 Reorder the terms: -1.7 + x = -1.757839583 Solving -1.7 + x = -1.757839583 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.7' to each side of the equation. -1.7 + 1.7 + x = -1.757839583 + 1.7 Combine like terms: -1.7 + 1.7 = 0.0 0.0 + x = -1.757839583 + 1.7 x = -1.757839583 + 1.7 Combine like terms: -1.757839583 + 1.7 = -0.057839583 x = -0.057839583 Simplifying x = -0.057839583

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.457839583, -0.057839583}

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