25x^2-20x+4=45

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Solution for 25x^2-20x+4=45 equation:


Simplifying
25x2 + -20x + 4 = 45

Reorder the terms:
4 + -20x + 25x2 = 45

Solving
4 + -20x + 25x2 = 45

Solving for variable 'x'.

Reorder the terms:
4 + -45 + -20x + 25x2 = 45 + -45

Combine like terms: 4 + -45 = -41
-41 + -20x + 25x2 = 45 + -45

Combine like terms: 45 + -45 = 0
-41 + -20x + 25x2 = 0

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

Divide each side by '25'.
-1.64 + -0.8x + x2 = 0

Move the constant term to the right:

Add '1.64' to each side of the equation.
-1.64 + -0.8x + 1.64 + x2 = 0 + 1.64

Reorder the terms:
-1.64 + 1.64 + -0.8x + x2 = 0 + 1.64

Combine like terms: -1.64 + 1.64 = 0.00
0.00 + -0.8x + x2 = 0 + 1.64
-0.8x + x2 = 0 + 1.64

Combine like terms: 0 + 1.64 = 1.64
-0.8x + x2 = 1.64

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 = 1.64 + 0.16

Reorder the terms:
0.16 + -0.8x + x2 = 1.64 + 0.16

Combine like terms: 1.64 + 0.16 = 1.8
0.16 + -0.8x + x2 = 1.8

Factor a perfect square on the left side:
(x + -0.4)(x + -0.4) = 1.8

Calculate the square root of the right side: 1.341640787

Break this problem into two subproblems by setting 
(x + -0.4) equal to 1.341640787 and -1.341640787.

Subproblem 1

x + -0.4 = 1.341640787 Simplifying x + -0.4 = 1.341640787 Reorder the terms: -0.4 + x = 1.341640787 Solving -0.4 + x = 1.341640787 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 = 1.341640787 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + x = 1.341640787 + 0.4 x = 1.341640787 + 0.4 Combine like terms: 1.341640787 + 0.4 = 1.741640787 x = 1.741640787 Simplifying x = 1.741640787

Subproblem 2

x + -0.4 = -1.341640787 Simplifying x + -0.4 = -1.341640787 Reorder the terms: -0.4 + x = -1.341640787 Solving -0.4 + x = -1.341640787 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 = -1.341640787 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + x = -1.341640787 + 0.4 x = -1.341640787 + 0.4 Combine like terms: -1.341640787 + 0.4 = -0.941640787 x = -0.941640787 Simplifying x = -0.941640787

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.741640787, -0.941640787}

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