3x+x(x+2)=17

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


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

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

Combine like terms: 3x + 2x = 5x
5x + x2 = 17

Solving
5x + x2 = 17

Solving for variable 'x'.

Reorder the terms:
-17 + 5x + x2 = 17 + -17

Combine like terms: 17 + -17 = 0
-17 + 5x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '17' to each side of the equation.
-17 + 5x + 17 + x2 = 0 + 17

Reorder the terms:
-17 + 17 + 5x + x2 = 0 + 17

Combine like terms: -17 + 17 = 0
0 + 5x + x2 = 0 + 17
5x + x2 = 0 + 17

Combine like terms: 0 + 17 = 17
5x + x2 = 17

The x term is 5x.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5x + 6.25 + x2 = 17 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 17 + 6.25

Combine like terms: 17 + 6.25 = 23.25
6.25 + 5x + x2 = 23.25

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 23.25

Calculate the square root of the right side: 4.82182538

Break this problem into two subproblems by setting 
(x + 2.5) equal to 4.82182538 and -4.82182538.

Subproblem 1

x + 2.5 = 4.82182538 Simplifying x + 2.5 = 4.82182538 Reorder the terms: 2.5 + x = 4.82182538 Solving 2.5 + x = 4.82182538 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = 4.82182538 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 4.82182538 + -2.5 x = 4.82182538 + -2.5 Combine like terms: 4.82182538 + -2.5 = 2.32182538 x = 2.32182538 Simplifying x = 2.32182538

Subproblem 2

x + 2.5 = -4.82182538 Simplifying x + 2.5 = -4.82182538 Reorder the terms: 2.5 + x = -4.82182538 Solving 2.5 + x = -4.82182538 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = -4.82182538 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -4.82182538 + -2.5 x = -4.82182538 + -2.5 Combine like terms: -4.82182538 + -2.5 = -7.32182538 x = -7.32182538 Simplifying x = -7.32182538

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.32182538, -7.32182538}

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