4x^2-40x+45=0

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Solution for 4x^2-40x+45=0 equation:


Simplifying
4x2 + -40x + 45 = 0

Reorder the terms:
45 + -40x + 4x2 = 0

Solving
45 + -40x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
11.25 + -10x + x2 = 0

Move the constant term to the right:

Add '-11.25' to each side of the equation.
11.25 + -10x + -11.25 + x2 = 0 + -11.25

Reorder the terms:
11.25 + -11.25 + -10x + x2 = 0 + -11.25

Combine like terms: 11.25 + -11.25 = 0.00
0.00 + -10x + x2 = 0 + -11.25
-10x + x2 = 0 + -11.25

Combine like terms: 0 + -11.25 = -11.25
-10x + x2 = -11.25

The x term is -10x.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10x + 25 + x2 = -11.25 + 25

Reorder the terms:
25 + -10x + x2 = -11.25 + 25

Combine like terms: -11.25 + 25 = 13.75
25 + -10x + x2 = 13.75

Factor a perfect square on the left side:
(x + -5)(x + -5) = 13.75

Calculate the square root of the right side: 3.708099244

Break this problem into two subproblems by setting 
(x + -5) equal to 3.708099244 and -3.708099244.

Subproblem 1

x + -5 = 3.708099244 Simplifying x + -5 = 3.708099244 Reorder the terms: -5 + x = 3.708099244 Solving -5 + x = 3.708099244 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = 3.708099244 + 5 Combine like terms: -5 + 5 = 0 0 + x = 3.708099244 + 5 x = 3.708099244 + 5 Combine like terms: 3.708099244 + 5 = 8.708099244 x = 8.708099244 Simplifying x = 8.708099244

Subproblem 2

x + -5 = -3.708099244 Simplifying x + -5 = -3.708099244 Reorder the terms: -5 + x = -3.708099244 Solving -5 + x = -3.708099244 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = -3.708099244 + 5 Combine like terms: -5 + 5 = 0 0 + x = -3.708099244 + 5 x = -3.708099244 + 5 Combine like terms: -3.708099244 + 5 = 1.291900756 x = 1.291900756 Simplifying x = 1.291900756

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.708099244, 1.291900756}

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