5x(x+10)=3x+5x-6

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Solution for 5x(x+10)=3x+5x-6 equation:


Simplifying
5x(x + 10) = 3x + 5x + -6

Reorder the terms:
5x(10 + x) = 3x + 5x + -6
(10 * 5x + x * 5x) = 3x + 5x + -6
(50x + 5x2) = 3x + 5x + -6

Reorder the terms:
50x + 5x2 = -6 + 3x + 5x

Combine like terms: 3x + 5x = 8x
50x + 5x2 = -6 + 8x

Solving
50x + 5x2 = -6 + 8x

Solving for variable 'x'.

Reorder the terms:
6 + 50x + -8x + 5x2 = -6 + 8x + 6 + -8x

Combine like terms: 50x + -8x = 42x
6 + 42x + 5x2 = -6 + 8x + 6 + -8x

Reorder the terms:
6 + 42x + 5x2 = -6 + 6 + 8x + -8x

Combine like terms: -6 + 6 = 0
6 + 42x + 5x2 = 0 + 8x + -8x
6 + 42x + 5x2 = 8x + -8x

Combine like terms: 8x + -8x = 0
6 + 42x + 5x2 = 0

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

Divide each side by '5'.
1.2 + 8.4x + x2 = 0

Move the constant term to the right:

Add '-1.2' to each side of the equation.
1.2 + 8.4x + -1.2 + x2 = 0 + -1.2

Reorder the terms:
1.2 + -1.2 + 8.4x + x2 = 0 + -1.2

Combine like terms: 1.2 + -1.2 = 0.0
0.0 + 8.4x + x2 = 0 + -1.2
8.4x + x2 = 0 + -1.2

Combine like terms: 0 + -1.2 = -1.2
8.4x + x2 = -1.2

The x term is 8.4x.  Take half its coefficient (4.2).
Square it (17.64) and add it to both sides.

Add '17.64' to each side of the equation.
8.4x + 17.64 + x2 = -1.2 + 17.64

Reorder the terms:
17.64 + 8.4x + x2 = -1.2 + 17.64

Combine like terms: -1.2 + 17.64 = 16.44
17.64 + 8.4x + x2 = 16.44

Factor a perfect square on the left side:
(x + 4.2)(x + 4.2) = 16.44

Calculate the square root of the right side: 4.054626987

Break this problem into two subproblems by setting 
(x + 4.2) equal to 4.054626987 and -4.054626987.

Subproblem 1

x + 4.2 = 4.054626987 Simplifying x + 4.2 = 4.054626987 Reorder the terms: 4.2 + x = 4.054626987 Solving 4.2 + x = 4.054626987 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.2' to each side of the equation. 4.2 + -4.2 + x = 4.054626987 + -4.2 Combine like terms: 4.2 + -4.2 = 0.0 0.0 + x = 4.054626987 + -4.2 x = 4.054626987 + -4.2 Combine like terms: 4.054626987 + -4.2 = -0.145373013 x = -0.145373013 Simplifying x = -0.145373013

Subproblem 2

x + 4.2 = -4.054626987 Simplifying x + 4.2 = -4.054626987 Reorder the terms: 4.2 + x = -4.054626987 Solving 4.2 + x = -4.054626987 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.2' to each side of the equation. 4.2 + -4.2 + x = -4.054626987 + -4.2 Combine like terms: 4.2 + -4.2 = 0.0 0.0 + x = -4.054626987 + -4.2 x = -4.054626987 + -4.2 Combine like terms: -4.054626987 + -4.2 = -8.254626987 x = -8.254626987 Simplifying x = -8.254626987

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.145373013, -8.254626987}

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