5x(x+7)=3x+17

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Solution for 5x(x+7)=3x+17 equation:


Simplifying
5x(x + 7) = 3x + 17

Reorder the terms:
5x(7 + x) = 3x + 17
(7 * 5x + x * 5x) = 3x + 17
(35x + 5x2) = 3x + 17

Reorder the terms:
35x + 5x2 = 17 + 3x

Solving
35x + 5x2 = 17 + 3x

Solving for variable 'x'.

Reorder the terms:
-17 + 35x + -3x + 5x2 = 17 + 3x + -17 + -3x

Combine like terms: 35x + -3x = 32x
-17 + 32x + 5x2 = 17 + 3x + -17 + -3x

Reorder the terms:
-17 + 32x + 5x2 = 17 + -17 + 3x + -3x

Combine like terms: 17 + -17 = 0
-17 + 32x + 5x2 = 0 + 3x + -3x
-17 + 32x + 5x2 = 3x + -3x

Combine like terms: 3x + -3x = 0
-17 + 32x + 5x2 = 0

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

Divide each side by '5'.
-3.4 + 6.4x + x2 = 0

Move the constant term to the right:

Add '3.4' to each side of the equation.
-3.4 + 6.4x + 3.4 + x2 = 0 + 3.4

Reorder the terms:
-3.4 + 3.4 + 6.4x + x2 = 0 + 3.4

Combine like terms: -3.4 + 3.4 = 0.0
0.0 + 6.4x + x2 = 0 + 3.4
6.4x + x2 = 0 + 3.4

Combine like terms: 0 + 3.4 = 3.4
6.4x + x2 = 3.4

The x term is 6.4x.  Take half its coefficient (3.2).
Square it (10.24) and add it to both sides.

Add '10.24' to each side of the equation.
6.4x + 10.24 + x2 = 3.4 + 10.24

Reorder the terms:
10.24 + 6.4x + x2 = 3.4 + 10.24

Combine like terms: 3.4 + 10.24 = 13.64
10.24 + 6.4x + x2 = 13.64

Factor a perfect square on the left side:
(x + 3.2)(x + 3.2) = 13.64

Calculate the square root of the right side: 3.693237063

Break this problem into two subproblems by setting 
(x + 3.2) equal to 3.693237063 and -3.693237063.

Subproblem 1

x + 3.2 = 3.693237063 Simplifying x + 3.2 = 3.693237063 Reorder the terms: 3.2 + x = 3.693237063 Solving 3.2 + x = 3.693237063 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.2' to each side of the equation. 3.2 + -3.2 + x = 3.693237063 + -3.2 Combine like terms: 3.2 + -3.2 = 0.0 0.0 + x = 3.693237063 + -3.2 x = 3.693237063 + -3.2 Combine like terms: 3.693237063 + -3.2 = 0.493237063 x = 0.493237063 Simplifying x = 0.493237063

Subproblem 2

x + 3.2 = -3.693237063 Simplifying x + 3.2 = -3.693237063 Reorder the terms: 3.2 + x = -3.693237063 Solving 3.2 + x = -3.693237063 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.2' to each side of the equation. 3.2 + -3.2 + x = -3.693237063 + -3.2 Combine like terms: 3.2 + -3.2 = 0.0 0.0 + x = -3.693237063 + -3.2 x = -3.693237063 + -3.2 Combine like terms: -3.693237063 + -3.2 = -6.893237063 x = -6.893237063 Simplifying x = -6.893237063

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.493237063, -6.893237063}

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