(5x-2)(5x-2)=15

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Solution for (5x-2)(5x-2)=15 equation:


Simplifying
(5x + -2)(5x + -2) = 15

Reorder the terms:
(-2 + 5x)(5x + -2) = 15

Reorder the terms:
(-2 + 5x)(-2 + 5x) = 15

Multiply (-2 + 5x) * (-2 + 5x)
(-2(-2 + 5x) + 5x * (-2 + 5x)) = 15
((-2 * -2 + 5x * -2) + 5x * (-2 + 5x)) = 15
((4 + -10x) + 5x * (-2 + 5x)) = 15
(4 + -10x + (-2 * 5x + 5x * 5x)) = 15
(4 + -10x + (-10x + 25x2)) = 15

Combine like terms: -10x + -10x = -20x
(4 + -20x + 25x2) = 15

Solving
4 + -20x + 25x2 = 15

Solving for variable 'x'.

Reorder the terms:
4 + -15 + -20x + 25x2 = 15 + -15

Combine like terms: 4 + -15 = -11
-11 + -20x + 25x2 = 15 + -15

Combine like terms: 15 + -15 = 0
-11 + -20x + 25x2 = 0

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

Divide each side by '25'.
-0.44 + -0.8x + x2 = 0

Move the constant term to the right:

Add '0.44' to each side of the equation.
-0.44 + -0.8x + 0.44 + x2 = 0 + 0.44

Reorder the terms:
-0.44 + 0.44 + -0.8x + x2 = 0 + 0.44

Combine like terms: -0.44 + 0.44 = 0.00
0.00 + -0.8x + x2 = 0 + 0.44
-0.8x + x2 = 0 + 0.44

Combine like terms: 0 + 0.44 = 0.44
-0.8x + x2 = 0.44

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 = 0.44 + 0.16

Reorder the terms:
0.16 + -0.8x + x2 = 0.44 + 0.16

Combine like terms: 0.44 + 0.16 = 0.6
0.16 + -0.8x + x2 = 0.6

Factor a perfect square on the left side:
(x + -0.4)(x + -0.4) = 0.6

Calculate the square root of the right side: 0.774596669

Break this problem into two subproblems by setting 
(x + -0.4) equal to 0.774596669 and -0.774596669.

Subproblem 1

x + -0.4 = 0.774596669 Simplifying x + -0.4 = 0.774596669 Reorder the terms: -0.4 + x = 0.774596669 Solving -0.4 + x = 0.774596669 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 = 0.774596669 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + x = 0.774596669 + 0.4 x = 0.774596669 + 0.4 Combine like terms: 0.774596669 + 0.4 = 1.174596669 x = 1.174596669 Simplifying x = 1.174596669

Subproblem 2

x + -0.4 = -0.774596669 Simplifying x + -0.4 = -0.774596669 Reorder the terms: -0.4 + x = -0.774596669 Solving -0.4 + x = -0.774596669 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 = -0.774596669 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + x = -0.774596669 + 0.4 x = -0.774596669 + 0.4 Combine like terms: -0.774596669 + 0.4 = -0.374596669 x = -0.374596669 Simplifying x = -0.374596669

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.174596669, -0.374596669}

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