2x(x+5)=17-3x

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Solution for 2x(x+5)=17-3x equation:


Simplifying
2x(x + 5) = 17 + -3x

Reorder the terms:
2x(5 + x) = 17 + -3x
(5 * 2x + x * 2x) = 17 + -3x
(10x + 2x2) = 17 + -3x

Solving
10x + 2x2 = 17 + -3x

Solving for variable 'x'.

Reorder the terms:
-17 + 10x + 3x + 2x2 = 17 + -3x + -17 + 3x

Combine like terms: 10x + 3x = 13x
-17 + 13x + 2x2 = 17 + -3x + -17 + 3x

Reorder the terms:
-17 + 13x + 2x2 = 17 + -17 + -3x + 3x

Combine like terms: 17 + -17 = 0
-17 + 13x + 2x2 = 0 + -3x + 3x
-17 + 13x + 2x2 = -3x + 3x

Combine like terms: -3x + 3x = 0
-17 + 13x + 2x2 = 0

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

Divide each side by '2'.
-8.5 + 6.5x + x2 = 0

Move the constant term to the right:

Add '8.5' to each side of the equation.
-8.5 + 6.5x + 8.5 + x2 = 0 + 8.5

Reorder the terms:
-8.5 + 8.5 + 6.5x + x2 = 0 + 8.5

Combine like terms: -8.5 + 8.5 = 0.0
0.0 + 6.5x + x2 = 0 + 8.5
6.5x + x2 = 0 + 8.5

Combine like terms: 0 + 8.5 = 8.5
6.5x + x2 = 8.5

The x term is 6.5x.  Take half its coefficient (3.25).
Square it (10.5625) and add it to both sides.

Add '10.5625' to each side of the equation.
6.5x + 10.5625 + x2 = 8.5 + 10.5625

Reorder the terms:
10.5625 + 6.5x + x2 = 8.5 + 10.5625

Combine like terms: 8.5 + 10.5625 = 19.0625
10.5625 + 6.5x + x2 = 19.0625

Factor a perfect square on the left side:
(x + 3.25)(x + 3.25) = 19.0625

Calculate the square root of the right side: 4.366062299

Break this problem into two subproblems by setting 
(x + 3.25) equal to 4.366062299 and -4.366062299.

Subproblem 1

x + 3.25 = 4.366062299 Simplifying x + 3.25 = 4.366062299 Reorder the terms: 3.25 + x = 4.366062299 Solving 3.25 + x = 4.366062299 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.25' to each side of the equation. 3.25 + -3.25 + x = 4.366062299 + -3.25 Combine like terms: 3.25 + -3.25 = 0.00 0.00 + x = 4.366062299 + -3.25 x = 4.366062299 + -3.25 Combine like terms: 4.366062299 + -3.25 = 1.116062299 x = 1.116062299 Simplifying x = 1.116062299

Subproblem 2

x + 3.25 = -4.366062299 Simplifying x + 3.25 = -4.366062299 Reorder the terms: 3.25 + x = -4.366062299 Solving 3.25 + x = -4.366062299 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.25' to each side of the equation. 3.25 + -3.25 + x = -4.366062299 + -3.25 Combine like terms: 3.25 + -3.25 = 0.00 0.00 + x = -4.366062299 + -3.25 x = -4.366062299 + -3.25 Combine like terms: -4.366062299 + -3.25 = -7.616062299 x = -7.616062299 Simplifying x = -7.616062299

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.116062299, -7.616062299}

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