5x(x+3)=3(8x-1)

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Solution for 5x(x+3)=3(8x-1) equation:


Simplifying
5x(x + 3) = 3(8x + -1)

Reorder the terms:
5x(3 + x) = 3(8x + -1)
(3 * 5x + x * 5x) = 3(8x + -1)
(15x + 5x2) = 3(8x + -1)

Reorder the terms:
15x + 5x2 = 3(-1 + 8x)
15x + 5x2 = (-1 * 3 + 8x * 3)
15x + 5x2 = (-3 + 24x)

Solving
15x + 5x2 = -3 + 24x

Solving for variable 'x'.

Reorder the terms:
3 + 15x + -24x + 5x2 = -3 + 24x + 3 + -24x

Combine like terms: 15x + -24x = -9x
3 + -9x + 5x2 = -3 + 24x + 3 + -24x

Reorder the terms:
3 + -9x + 5x2 = -3 + 3 + 24x + -24x

Combine like terms: -3 + 3 = 0
3 + -9x + 5x2 = 0 + 24x + -24x
3 + -9x + 5x2 = 24x + -24x

Combine like terms: 24x + -24x = 0
3 + -9x + 5x2 = 0

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

Divide each side by '5'.
0.6 + -1.8x + x2 = 0

Move the constant term to the right:

Add '-0.6' to each side of the equation.
0.6 + -1.8x + -0.6 + x2 = 0 + -0.6

Reorder the terms:
0.6 + -0.6 + -1.8x + x2 = 0 + -0.6

Combine like terms: 0.6 + -0.6 = 0.0
0.0 + -1.8x + x2 = 0 + -0.6
-1.8x + x2 = 0 + -0.6

Combine like terms: 0 + -0.6 = -0.6
-1.8x + x2 = -0.6

The x term is -1.8x.  Take half its coefficient (-0.9).
Square it (0.81) and add it to both sides.

Add '0.81' to each side of the equation.
-1.8x + 0.81 + x2 = -0.6 + 0.81

Reorder the terms:
0.81 + -1.8x + x2 = -0.6 + 0.81

Combine like terms: -0.6 + 0.81 = 0.21
0.81 + -1.8x + x2 = 0.21

Factor a perfect square on the left side:
(x + -0.9)(x + -0.9) = 0.21

Calculate the square root of the right side: 0.458257569

Break this problem into two subproblems by setting 
(x + -0.9) equal to 0.458257569 and -0.458257569.

Subproblem 1

x + -0.9 = 0.458257569 Simplifying x + -0.9 = 0.458257569 Reorder the terms: -0.9 + x = 0.458257569 Solving -0.9 + x = 0.458257569 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9' to each side of the equation. -0.9 + 0.9 + x = 0.458257569 + 0.9 Combine like terms: -0.9 + 0.9 = 0.0 0.0 + x = 0.458257569 + 0.9 x = 0.458257569 + 0.9 Combine like terms: 0.458257569 + 0.9 = 1.358257569 x = 1.358257569 Simplifying x = 1.358257569

Subproblem 2

x + -0.9 = -0.458257569 Simplifying x + -0.9 = -0.458257569 Reorder the terms: -0.9 + x = -0.458257569 Solving -0.9 + x = -0.458257569 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9' to each side of the equation. -0.9 + 0.9 + x = -0.458257569 + 0.9 Combine like terms: -0.9 + 0.9 = 0.0 0.0 + x = -0.458257569 + 0.9 x = -0.458257569 + 0.9 Combine like terms: -0.458257569 + 0.9 = 0.441742431 x = 0.441742431 Simplifying x = 0.441742431

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.358257569, 0.441742431}

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