25x^2-20x+4=17

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Solution for 25x^2-20x+4=17 equation:


Simplifying
25x2 + -20x + 4 = 17

Reorder the terms:
4 + -20x + 25x2 = 17

Solving
4 + -20x + 25x2 = 17

Solving for variable 'x'.

Reorder the terms:
4 + -17 + -20x + 25x2 = 17 + -17

Combine like terms: 4 + -17 = -13
-13 + -20x + 25x2 = 17 + -17

Combine like terms: 17 + -17 = 0
-13 + -20x + 25x2 = 0

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

Divide each side by '25'.
-0.52 + -0.8x + x2 = 0

Move the constant term to the right:

Add '0.52' to each side of the equation.
-0.52 + -0.8x + 0.52 + x2 = 0 + 0.52

Reorder the terms:
-0.52 + 0.52 + -0.8x + x2 = 0 + 0.52

Combine like terms: -0.52 + 0.52 = 0.00
0.00 + -0.8x + x2 = 0 + 0.52
-0.8x + x2 = 0 + 0.52

Combine like terms: 0 + 0.52 = 0.52
-0.8x + x2 = 0.52

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 = 0.52 + 0.16

Reorder the terms:
0.16 + -0.8x + x2 = 0.52 + 0.16

Combine like terms: 0.52 + 0.16 = 0.68
0.16 + -0.8x + x2 = 0.68

Factor a perfect square on the left side:
(x + -0.4)(x + -0.4) = 0.68

Calculate the square root of the right side: 0.824621125

Break this problem into two subproblems by setting 
(x + -0.4) equal to 0.824621125 and -0.824621125.

Subproblem 1

x + -0.4 = 0.824621125 Simplifying x + -0.4 = 0.824621125 Reorder the terms: -0.4 + x = 0.824621125 Solving -0.4 + x = 0.824621125 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 = 0.824621125 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + x = 0.824621125 + 0.4 x = 0.824621125 + 0.4 Combine like terms: 0.824621125 + 0.4 = 1.224621125 x = 1.224621125 Simplifying x = 1.224621125

Subproblem 2

x + -0.4 = -0.824621125 Simplifying x + -0.4 = -0.824621125 Reorder the terms: -0.4 + x = -0.824621125 Solving -0.4 + x = -0.824621125 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 = -0.824621125 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + x = -0.824621125 + 0.4 x = -0.824621125 + 0.4 Combine like terms: -0.824621125 + 0.4 = -0.424621125 x = -0.424621125 Simplifying x = -0.424621125

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.224621125, -0.424621125}

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