5x^2-4x+1=225

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Solution for 5x^2-4x+1=225 equation:


Simplifying
5x2 + -4x + 1 = 225

Reorder the terms:
1 + -4x + 5x2 = 225

Solving
1 + -4x + 5x2 = 225

Solving for variable 'x'.

Reorder the terms:
1 + -225 + -4x + 5x2 = 225 + -225

Combine like terms: 1 + -225 = -224
-224 + -4x + 5x2 = 225 + -225

Combine like terms: 225 + -225 = 0
-224 + -4x + 5x2 = 0

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

Divide each side by '5'.
-44.8 + -0.8x + x2 = 0

Move the constant term to the right:

Add '44.8' to each side of the equation.
-44.8 + -0.8x + 44.8 + x2 = 0 + 44.8

Reorder the terms:
-44.8 + 44.8 + -0.8x + x2 = 0 + 44.8

Combine like terms: -44.8 + 44.8 = 0.0
0.0 + -0.8x + x2 = 0 + 44.8
-0.8x + x2 = 0 + 44.8

Combine like terms: 0 + 44.8 = 44.8
-0.8x + x2 = 44.8

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 = 44.8 + 0.16

Reorder the terms:
0.16 + -0.8x + x2 = 44.8 + 0.16

Combine like terms: 44.8 + 0.16 = 44.96
0.16 + -0.8x + x2 = 44.96

Factor a perfect square on the left side:
(x + -0.4)(x + -0.4) = 44.96

Calculate the square root of the right side: 6.705221846

Break this problem into two subproblems by setting 
(x + -0.4) equal to 6.705221846 and -6.705221846.

Subproblem 1

x + -0.4 = 6.705221846 Simplifying x + -0.4 = 6.705221846 Reorder the terms: -0.4 + x = 6.705221846 Solving -0.4 + x = 6.705221846 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 = 6.705221846 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + x = 6.705221846 + 0.4 x = 6.705221846 + 0.4 Combine like terms: 6.705221846 + 0.4 = 7.105221846 x = 7.105221846 Simplifying x = 7.105221846

Subproblem 2

x + -0.4 = -6.705221846 Simplifying x + -0.4 = -6.705221846 Reorder the terms: -0.4 + x = -6.705221846 Solving -0.4 + x = -6.705221846 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 = -6.705221846 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + x = -6.705221846 + 0.4 x = -6.705221846 + 0.4 Combine like terms: -6.705221846 + 0.4 = -6.305221846 x = -6.305221846 Simplifying x = -6.305221846

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.105221846, -6.305221846}

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