x(2x-5)=45

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Solution for x(2x-5)=45 equation:


Simplifying
x(2x + -5) = 45

Reorder the terms:
x(-5 + 2x) = 45
(-5 * x + 2x * x) = 45
(-5x + 2x2) = 45

Solving
-5x + 2x2 = 45

Solving for variable 'x'.

Reorder the terms:
-45 + -5x + 2x2 = 45 + -45

Combine like terms: 45 + -45 = 0
-45 + -5x + 2x2 = 0

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

Divide each side by '2'.
-22.5 + -2.5x + x2 = 0

Move the constant term to the right:

Add '22.5' to each side of the equation.
-22.5 + -2.5x + 22.5 + x2 = 0 + 22.5

Reorder the terms:
-22.5 + 22.5 + -2.5x + x2 = 0 + 22.5

Combine like terms: -22.5 + 22.5 = 0.0
0.0 + -2.5x + x2 = 0 + 22.5
-2.5x + x2 = 0 + 22.5

Combine like terms: 0 + 22.5 = 22.5
-2.5x + x2 = 22.5

The x term is -2.5x.  Take half its coefficient (-1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
-2.5x + 1.5625 + x2 = 22.5 + 1.5625

Reorder the terms:
1.5625 + -2.5x + x2 = 22.5 + 1.5625

Combine like terms: 22.5 + 1.5625 = 24.0625
1.5625 + -2.5x + x2 = 24.0625

Factor a perfect square on the left side:
(x + -1.25)(x + -1.25) = 24.0625

Calculate the square root of the right side: 4.905354218

Break this problem into two subproblems by setting 
(x + -1.25) equal to 4.905354218 and -4.905354218.

Subproblem 1

x + -1.25 = 4.905354218 Simplifying x + -1.25 = 4.905354218 Reorder the terms: -1.25 + x = 4.905354218 Solving -1.25 + x = 4.905354218 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + x = 4.905354218 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = 4.905354218 + 1.25 x = 4.905354218 + 1.25 Combine like terms: 4.905354218 + 1.25 = 6.155354218 x = 6.155354218 Simplifying x = 6.155354218

Subproblem 2

x + -1.25 = -4.905354218 Simplifying x + -1.25 = -4.905354218 Reorder the terms: -1.25 + x = -4.905354218 Solving -1.25 + x = -4.905354218 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + x = -4.905354218 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = -4.905354218 + 1.25 x = -4.905354218 + 1.25 Combine like terms: -4.905354218 + 1.25 = -3.655354218 x = -3.655354218 Simplifying x = -3.655354218

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.155354218, -3.655354218}

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