(5x+1)(5x+1)=7

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Solution for (5x+1)(5x+1)=7 equation:


Simplifying
(5x + 1)(5x + 1) = 7

Reorder the terms:
(1 + 5x)(5x + 1) = 7

Reorder the terms:
(1 + 5x)(1 + 5x) = 7

Multiply (1 + 5x) * (1 + 5x)
(1(1 + 5x) + 5x * (1 + 5x)) = 7
((1 * 1 + 5x * 1) + 5x * (1 + 5x)) = 7
((1 + 5x) + 5x * (1 + 5x)) = 7
(1 + 5x + (1 * 5x + 5x * 5x)) = 7
(1 + 5x + (5x + 25x2)) = 7

Combine like terms: 5x + 5x = 10x
(1 + 10x + 25x2) = 7

Solving
1 + 10x + 25x2 = 7

Solving for variable 'x'.

Reorder the terms:
1 + -7 + 10x + 25x2 = 7 + -7

Combine like terms: 1 + -7 = -6
-6 + 10x + 25x2 = 7 + -7

Combine like terms: 7 + -7 = 0
-6 + 10x + 25x2 = 0

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

Divide each side by '25'.
-0.24 + 0.4x + x2 = 0

Move the constant term to the right:

Add '0.24' to each side of the equation.
-0.24 + 0.4x + 0.24 + x2 = 0 + 0.24

Reorder the terms:
-0.24 + 0.24 + 0.4x + x2 = 0 + 0.24

Combine like terms: -0.24 + 0.24 = 0.00
0.00 + 0.4x + x2 = 0 + 0.24
0.4x + x2 = 0 + 0.24

Combine like terms: 0 + 0.24 = 0.24
0.4x + x2 = 0.24

The x term is 0.4x.  Take half its coefficient (0.2).
Square it (0.04) and add it to both sides.

Add '0.04' to each side of the equation.
0.4x + 0.04 + x2 = 0.24 + 0.04

Reorder the terms:
0.04 + 0.4x + x2 = 0.24 + 0.04

Combine like terms: 0.24 + 0.04 = 0.28
0.04 + 0.4x + x2 = 0.28

Factor a perfect square on the left side:
(x + 0.2)(x + 0.2) = 0.28

Calculate the square root of the right side: 0.529150262

Break this problem into two subproblems by setting 
(x + 0.2) equal to 0.529150262 and -0.529150262.

Subproblem 1

x + 0.2 = 0.529150262 Simplifying x + 0.2 = 0.529150262 Reorder the terms: 0.2 + x = 0.529150262 Solving 0.2 + x = 0.529150262 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2' to each side of the equation. 0.2 + -0.2 + x = 0.529150262 + -0.2 Combine like terms: 0.2 + -0.2 = 0.0 0.0 + x = 0.529150262 + -0.2 x = 0.529150262 + -0.2 Combine like terms: 0.529150262 + -0.2 = 0.329150262 x = 0.329150262 Simplifying x = 0.329150262

Subproblem 2

x + 0.2 = -0.529150262 Simplifying x + 0.2 = -0.529150262 Reorder the terms: 0.2 + x = -0.529150262 Solving 0.2 + x = -0.529150262 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2' to each side of the equation. 0.2 + -0.2 + x = -0.529150262 + -0.2 Combine like terms: 0.2 + -0.2 = 0.0 0.0 + x = -0.529150262 + -0.2 x = -0.529150262 + -0.2 Combine like terms: -0.529150262 + -0.2 = -0.729150262 x = -0.729150262 Simplifying x = -0.729150262

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.329150262, -0.729150262}

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