x(2x+5)=50

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Solution for x(2x+5)=50 equation:


Simplifying
x(2x + 5) = 50

Reorder the terms:
x(5 + 2x) = 50
(5 * x + 2x * x) = 50
(5x + 2x2) = 50

Solving
5x + 2x2 = 50

Solving for variable 'x'.

Reorder the terms:
-50 + 5x + 2x2 = 50 + -50

Combine like terms: 50 + -50 = 0
-50 + 5x + 2x2 = 0

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

Divide each side by '2'.
-25 + 2.5x + x2 = 0

Move the constant term to the right:

Add '25' to each side of the equation.
-25 + 2.5x + 25 + x2 = 0 + 25

Reorder the terms:
-25 + 25 + 2.5x + x2 = 0 + 25

Combine like terms: -25 + 25 = 0
0 + 2.5x + x2 = 0 + 25
2.5x + x2 = 0 + 25

Combine like terms: 0 + 25 = 25
2.5x + x2 = 25

The x term is 2.5x.  Take half its coefficient (1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
2.5x + 1.5625 + x2 = 25 + 1.5625

Reorder the terms:
1.5625 + 2.5x + x2 = 25 + 1.5625

Combine like terms: 25 + 1.5625 = 26.5625
1.5625 + 2.5x + x2 = 26.5625

Factor a perfect square on the left side:
(x + 1.25)(x + 1.25) = 26.5625

Calculate the square root of the right side: 5.153882032

Break this problem into two subproblems by setting 
(x + 1.25) equal to 5.153882032 and -5.153882032.

Subproblem 1

x + 1.25 = 5.153882032 Simplifying x + 1.25 = 5.153882032 Reorder the terms: 1.25 + x = 5.153882032 Solving 1.25 + x = 5.153882032 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = 5.153882032 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = 5.153882032 + -1.25 x = 5.153882032 + -1.25 Combine like terms: 5.153882032 + -1.25 = 3.903882032 x = 3.903882032 Simplifying x = 3.903882032

Subproblem 2

x + 1.25 = -5.153882032 Simplifying x + 1.25 = -5.153882032 Reorder the terms: 1.25 + x = -5.153882032 Solving 1.25 + x = -5.153882032 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = -5.153882032 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = -5.153882032 + -1.25 x = -5.153882032 + -1.25 Combine like terms: -5.153882032 + -1.25 = -6.403882032 x = -6.403882032 Simplifying x = -6.403882032

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.903882032, -6.403882032}

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