4x(2x+5)=5

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Solution for 4x(2x+5)=5 equation:


Simplifying
4x(2x + 5) = 5

Reorder the terms:
4x(5 + 2x) = 5
(5 * 4x + 2x * 4x) = 5
(20x + 8x2) = 5

Solving
20x + 8x2 = 5

Solving for variable 'x'.

Reorder the terms:
-5 + 20x + 8x2 = 5 + -5

Combine like terms: 5 + -5 = 0
-5 + 20x + 8x2 = 0

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

Divide each side by '8'.
-0.625 + 2.5x + x2 = 0

Move the constant term to the right:

Add '0.625' to each side of the equation.
-0.625 + 2.5x + 0.625 + x2 = 0 + 0.625

Reorder the terms:
-0.625 + 0.625 + 2.5x + x2 = 0 + 0.625

Combine like terms: -0.625 + 0.625 = 0.000
0.000 + 2.5x + x2 = 0 + 0.625
2.5x + x2 = 0 + 0.625

Combine like terms: 0 + 0.625 = 0.625
2.5x + x2 = 0.625

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 = 0.625 + 1.5625

Reorder the terms:
1.5625 + 2.5x + x2 = 0.625 + 1.5625

Combine like terms: 0.625 + 1.5625 = 2.1875
1.5625 + 2.5x + x2 = 2.1875

Factor a perfect square on the left side:
(x + 1.25)(x + 1.25) = 2.1875

Calculate the square root of the right side: 1.479019946

Break this problem into two subproblems by setting 
(x + 1.25) equal to 1.479019946 and -1.479019946.

Subproblem 1

x + 1.25 = 1.479019946 Simplifying x + 1.25 = 1.479019946 Reorder the terms: 1.25 + x = 1.479019946 Solving 1.25 + x = 1.479019946 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 = 1.479019946 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = 1.479019946 + -1.25 x = 1.479019946 + -1.25 Combine like terms: 1.479019946 + -1.25 = 0.229019946 x = 0.229019946 Simplifying x = 0.229019946

Subproblem 2

x + 1.25 = -1.479019946 Simplifying x + 1.25 = -1.479019946 Reorder the terms: 1.25 + x = -1.479019946 Solving 1.25 + x = -1.479019946 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 = -1.479019946 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = -1.479019946 + -1.25 x = -1.479019946 + -1.25 Combine like terms: -1.479019946 + -1.25 = -2.729019946 x = -2.729019946 Simplifying x = -2.729019946

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.229019946, -2.729019946}

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