x=5x(x+8)+5(2x-1)

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Solution for x=5x(x+8)+5(2x-1) equation:


Simplifying
x = 5x(x + 8) + 5(2x + -1)

Reorder the terms:
x = 5x(8 + x) + 5(2x + -1)
x = (8 * 5x + x * 5x) + 5(2x + -1)
x = (40x + 5x2) + 5(2x + -1)

Reorder the terms:
x = 40x + 5x2 + 5(-1 + 2x)
x = 40x + 5x2 + (-1 * 5 + 2x * 5)
x = 40x + 5x2 + (-5 + 10x)

Reorder the terms:
x = -5 + 40x + 10x + 5x2

Combine like terms: 40x + 10x = 50x
x = -5 + 50x + 5x2

Solving
x = -5 + 50x + 5x2

Solving for variable 'x'.

Reorder the terms:
5 + x + -50x + -5x2 = -5 + 50x + 5x2 + 5 + -50x + -5x2

Combine like terms: x + -50x = -49x
5 + -49x + -5x2 = -5 + 50x + 5x2 + 5 + -50x + -5x2

Reorder the terms:
5 + -49x + -5x2 = -5 + 5 + 50x + -50x + 5x2 + -5x2

Combine like terms: -5 + 5 = 0
5 + -49x + -5x2 = 0 + 50x + -50x + 5x2 + -5x2
5 + -49x + -5x2 = 50x + -50x + 5x2 + -5x2

Combine like terms: 50x + -50x = 0
5 + -49x + -5x2 = 0 + 5x2 + -5x2
5 + -49x + -5x2 = 5x2 + -5x2

Combine like terms: 5x2 + -5x2 = 0
5 + -49x + -5x2 = 0

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

Divide each side by '-5'.
-1 + 9.8x + x2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + 9.8x + 1 + x2 = 0 + 1

Reorder the terms:
-1 + 1 + 9.8x + x2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + 9.8x + x2 = 0 + 1
9.8x + x2 = 0 + 1

Combine like terms: 0 + 1 = 1
9.8x + x2 = 1

The x term is 9.8x.  Take half its coefficient (4.9).
Square it (24.01) and add it to both sides.

Add '24.01' to each side of the equation.
9.8x + 24.01 + x2 = 1 + 24.01

Reorder the terms:
24.01 + 9.8x + x2 = 1 + 24.01

Combine like terms: 1 + 24.01 = 25.01
24.01 + 9.8x + x2 = 25.01

Factor a perfect square on the left side:
(x + 4.9)(x + 4.9) = 25.01

Calculate the square root of the right side: 5.0009999

Break this problem into two subproblems by setting 
(x + 4.9) equal to 5.0009999 and -5.0009999.

Subproblem 1

x + 4.9 = 5.0009999 Simplifying x + 4.9 = 5.0009999 Reorder the terms: 4.9 + x = 5.0009999 Solving 4.9 + x = 5.0009999 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.9' to each side of the equation. 4.9 + -4.9 + x = 5.0009999 + -4.9 Combine like terms: 4.9 + -4.9 = 0.0 0.0 + x = 5.0009999 + -4.9 x = 5.0009999 + -4.9 Combine like terms: 5.0009999 + -4.9 = 0.1009999 x = 0.1009999 Simplifying x = 0.1009999

Subproblem 2

x + 4.9 = -5.0009999 Simplifying x + 4.9 = -5.0009999 Reorder the terms: 4.9 + x = -5.0009999 Solving 4.9 + x = -5.0009999 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.9' to each side of the equation. 4.9 + -4.9 + x = -5.0009999 + -4.9 Combine like terms: 4.9 + -4.9 = 0.0 0.0 + x = -5.0009999 + -4.9 x = -5.0009999 + -4.9 Combine like terms: -5.0009999 + -4.9 = -9.9009999 x = -9.9009999 Simplifying x = -9.9009999

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.1009999, -9.9009999}

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