x(2x+8x-3)=9+7*2

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Solution for x(2x+8x-3)=9+7*2 equation:


Simplifying
x(2x + 8x + -3) = 9 + 7 * 2

Reorder the terms:
x(-3 + 2x + 8x) = 9 + 7 * 2

Combine like terms: 2x + 8x = 10x
x(-3 + 10x) = 9 + 7 * 2
(-3 * x + 10x * x) = 9 + 7 * 2
(-3x + 10x2) = 9 + 7 * 2

Multiply 7 * 2
-3x + 10x2 = 9 + 14

Combine like terms: 9 + 14 = 23
-3x + 10x2 = 23

Solving
-3x + 10x2 = 23

Solving for variable 'x'.

Reorder the terms:
-23 + -3x + 10x2 = 23 + -23

Combine like terms: 23 + -23 = 0
-23 + -3x + 10x2 = 0

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

Divide each side by '10'.
-2.3 + -0.3x + x2 = 0.0

Move the constant term to the right:

Add '2.3' to each side of the equation.
-2.3 + -0.3x + 2.3 + x2 = 0.0 + 2.3

Reorder the terms:
-2.3 + 2.3 + -0.3x + x2 = 0.0 + 2.3

Combine like terms: -2.3 + 2.3 = 0.0
0.0 + -0.3x + x2 = 0.0 + 2.3
-0.3x + x2 = 0.0 + 2.3

Combine like terms: 0.0 + 2.3 = 2.3
-0.3x + x2 = 2.3

The x term is -0.3x.  Take half its coefficient (-0.15).
Square it (0.0225) and add it to both sides.

Add '0.0225' to each side of the equation.
-0.3x + 0.0225 + x2 = 2.3 + 0.0225

Reorder the terms:
0.0225 + -0.3x + x2 = 2.3 + 0.0225

Combine like terms: 2.3 + 0.0225 = 2.3225
0.0225 + -0.3x + x2 = 2.3225

Factor a perfect square on the left side:
(x + -0.15)(x + -0.15) = 2.3225

Calculate the square root of the right side: 1.523975065

Break this problem into two subproblems by setting 
(x + -0.15) equal to 1.523975065 and -1.523975065.

Subproblem 1

x + -0.15 = 1.523975065 Simplifying x + -0.15 = 1.523975065 Reorder the terms: -0.15 + x = 1.523975065 Solving -0.15 + x = 1.523975065 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.15' to each side of the equation. -0.15 + 0.15 + x = 1.523975065 + 0.15 Combine like terms: -0.15 + 0.15 = 0.00 0.00 + x = 1.523975065 + 0.15 x = 1.523975065 + 0.15 Combine like terms: 1.523975065 + 0.15 = 1.673975065 x = 1.673975065 Simplifying x = 1.673975065

Subproblem 2

x + -0.15 = -1.523975065 Simplifying x + -0.15 = -1.523975065 Reorder the terms: -0.15 + x = -1.523975065 Solving -0.15 + x = -1.523975065 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.15' to each side of the equation. -0.15 + 0.15 + x = -1.523975065 + 0.15 Combine like terms: -0.15 + 0.15 = 0.00 0.00 + x = -1.523975065 + 0.15 x = -1.523975065 + 0.15 Combine like terms: -1.523975065 + 0.15 = -1.373975065 x = -1.373975065 Simplifying x = -1.373975065

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.673975065, -1.373975065}

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