2x^2-10x=45

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Solution for 2x^2-10x=45 equation:


Simplifying
2x2 + -10x = 45

Reorder the terms:
-10x + 2x2 = 45

Solving
-10x + 2x2 = 45

Solving for variable 'x'.

Reorder the terms:
-45 + -10x + 2x2 = 45 + -45

Combine like terms: 45 + -45 = 0
-45 + -10x + 2x2 = 0

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

Divide each side by '2'.
-22.5 + -5x + x2 = 0

Move the constant term to the right:

Add '22.5' to each side of the equation.
-22.5 + -5x + 22.5 + x2 = 0 + 22.5

Reorder the terms:
-22.5 + 22.5 + -5x + x2 = 0 + 22.5

Combine like terms: -22.5 + 22.5 = 0.0
0.0 + -5x + x2 = 0 + 22.5
-5x + x2 = 0 + 22.5

Combine like terms: 0 + 22.5 = 22.5
-5x + x2 = 22.5

The x term is -5x.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5x + 6.25 + x2 = 22.5 + 6.25

Reorder the terms:
6.25 + -5x + x2 = 22.5 + 6.25

Combine like terms: 22.5 + 6.25 = 28.75
6.25 + -5x + x2 = 28.75

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 28.75

Calculate the square root of the right side: 5.361902647

Break this problem into two subproblems by setting 
(x + -2.5) equal to 5.361902647 and -5.361902647.

Subproblem 1

x + -2.5 = 5.361902647 Simplifying x + -2.5 = 5.361902647 Reorder the terms: -2.5 + x = 5.361902647 Solving -2.5 + x = 5.361902647 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = 5.361902647 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 5.361902647 + 2.5 x = 5.361902647 + 2.5 Combine like terms: 5.361902647 + 2.5 = 7.861902647 x = 7.861902647 Simplifying x = 7.861902647

Subproblem 2

x + -2.5 = -5.361902647 Simplifying x + -2.5 = -5.361902647 Reorder the terms: -2.5 + x = -5.361902647 Solving -2.5 + x = -5.361902647 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = -5.361902647 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -5.361902647 + 2.5 x = -5.361902647 + 2.5 Combine like terms: -5.361902647 + 2.5 = -2.861902647 x = -2.861902647 Simplifying x = -2.861902647

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.861902647, -2.861902647}

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