(5x+2)(5x+2)-5=0

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Solution for (5x+2)(5x+2)-5=0 equation:


Simplifying
(5x + 2)(5x + 2) + -5 = 0

Reorder the terms:
(2 + 5x)(5x + 2) + -5 = 0

Reorder the terms:
(2 + 5x)(2 + 5x) + -5 = 0

Multiply (2 + 5x) * (2 + 5x)
(2(2 + 5x) + 5x * (2 + 5x)) + -5 = 0
((2 * 2 + 5x * 2) + 5x * (2 + 5x)) + -5 = 0
((4 + 10x) + 5x * (2 + 5x)) + -5 = 0
(4 + 10x + (2 * 5x + 5x * 5x)) + -5 = 0
(4 + 10x + (10x + 25x2)) + -5 = 0

Combine like terms: 10x + 10x = 20x
(4 + 20x + 25x2) + -5 = 0

Reorder the terms:
4 + -5 + 20x + 25x2 = 0

Combine like terms: 4 + -5 = -1
-1 + 20x + 25x2 = 0

Solving
-1 + 20x + 25x2 = 0

Solving for variable 'x'.

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

Divide each side by '25'.
-0.04 + 0.8x + x2 = 0

Move the constant term to the right:

Add '0.04' to each side of the equation.
-0.04 + 0.8x + 0.04 + x2 = 0 + 0.04

Reorder the terms:
-0.04 + 0.04 + 0.8x + x2 = 0 + 0.04

Combine like terms: -0.04 + 0.04 = 0.00
0.00 + 0.8x + x2 = 0 + 0.04
0.8x + x2 = 0 + 0.04

Combine like terms: 0 + 0.04 = 0.04
0.8x + x2 = 0.04

The x term is 0.8x.  Take half its coefficient (0.4).
Square it (0.16) and add it to both sides.

Add '0.16' to each side of the equation.
0.8x + 0.16 + x2 = 0.04 + 0.16

Reorder the terms:
0.16 + 0.8x + x2 = 0.04 + 0.16

Combine like terms: 0.04 + 0.16 = 0.2
0.16 + 0.8x + x2 = 0.2

Factor a perfect square on the left side:
(x + 0.4)(x + 0.4) = 0.2

Calculate the square root of the right side: 0.447213596

Break this problem into two subproblems by setting 
(x + 0.4) equal to 0.447213596 and -0.447213596.

Subproblem 1

x + 0.4 = 0.447213596 Simplifying x + 0.4 = 0.447213596 Reorder the terms: 0.4 + x = 0.447213596 Solving 0.4 + x = 0.447213596 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + x = 0.447213596 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + x = 0.447213596 + -0.4 x = 0.447213596 + -0.4 Combine like terms: 0.447213596 + -0.4 = 0.047213596 x = 0.047213596 Simplifying x = 0.047213596

Subproblem 2

x + 0.4 = -0.447213596 Simplifying x + 0.4 = -0.447213596 Reorder the terms: 0.4 + x = -0.447213596 Solving 0.4 + x = -0.447213596 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + x = -0.447213596 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + x = -0.447213596 + -0.4 x = -0.447213596 + -0.4 Combine like terms: -0.447213596 + -0.4 = -0.847213596 x = -0.847213596 Simplifying x = -0.847213596

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.047213596, -0.847213596}

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