3x+[-5x(x+3)]=8x+(-5x-9)

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Solution for 3x+[-5x(x+3)]=8x+(-5x-9) equation:


Simplifying
3x + [-5x(x + 3)] = 8x + (-5x + -9)

Reorder the terms:
3x + [-5x(3 + x)] = 8x + (-5x + -9)
3x + [(3 * -5x + x * -5x)] = 8x + (-5x + -9)
3x + [(-15x + -5x2)] = 8x + (-5x + -9)
3x + [-15x + -5x2] = 8x + (-5x + -9)

Remove brackets around [-15x + -5x2]
3x + -15x + -5x2 = 8x + (-5x + -9)

Combine like terms: 3x + -15x = -12x
-12x + -5x2 = 8x + (-5x + -9)

Reorder the terms:
-12x + -5x2 = 8x + (-9 + -5x)

Remove parenthesis around (-9 + -5x)
-12x + -5x2 = 8x + -9 + -5x

Reorder the terms:
-12x + -5x2 = -9 + 8x + -5x

Combine like terms: 8x + -5x = 3x
-12x + -5x2 = -9 + 3x

Solving
-12x + -5x2 = -9 + 3x

Solving for variable 'x'.

Reorder the terms:
9 + -12x + -3x + -5x2 = -9 + 3x + 9 + -3x

Combine like terms: -12x + -3x = -15x
9 + -15x + -5x2 = -9 + 3x + 9 + -3x

Reorder the terms:
9 + -15x + -5x2 = -9 + 9 + 3x + -3x

Combine like terms: -9 + 9 = 0
9 + -15x + -5x2 = 0 + 3x + -3x
9 + -15x + -5x2 = 3x + -3x

Combine like terms: 3x + -3x = 0
9 + -15x + -5x2 = 0

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

Divide each side by '-5'.
-1.8 + 3x + x2 = 0

Move the constant term to the right:

Add '1.8' to each side of the equation.
-1.8 + 3x + 1.8 + x2 = 0 + 1.8

Reorder the terms:
-1.8 + 1.8 + 3x + x2 = 0 + 1.8

Combine like terms: -1.8 + 1.8 = 0.0
0.0 + 3x + x2 = 0 + 1.8
3x + x2 = 0 + 1.8

Combine like terms: 0 + 1.8 = 1.8
3x + x2 = 1.8

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 = 1.8 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 1.8 + 2.25

Combine like terms: 1.8 + 2.25 = 4.05
2.25 + 3x + x2 = 4.05

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 4.05

Calculate the square root of the right side: 2.01246118

Break this problem into two subproblems by setting 
(x + 1.5) equal to 2.01246118 and -2.01246118.

Subproblem 1

x + 1.5 = 2.01246118 Simplifying x + 1.5 = 2.01246118 Reorder the terms: 1.5 + x = 2.01246118 Solving 1.5 + x = 2.01246118 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 = 2.01246118 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 2.01246118 + -1.5 x = 2.01246118 + -1.5 Combine like terms: 2.01246118 + -1.5 = 0.51246118 x = 0.51246118 Simplifying x = 0.51246118

Subproblem 2

x + 1.5 = -2.01246118 Simplifying x + 1.5 = -2.01246118 Reorder the terms: 1.5 + x = -2.01246118 Solving 1.5 + x = -2.01246118 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 = -2.01246118 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -2.01246118 + -1.5 x = -2.01246118 + -1.5 Combine like terms: -2.01246118 + -1.5 = -3.51246118 x = -3.51246118 Simplifying x = -3.51246118

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.51246118, -3.51246118}

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