-x^2+5x=2.25

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Solution for -x^2+5x=2.25 equation:


Simplifying
-1x2 + 5x = 2.25

Reorder the terms:
5x + -1x2 = 2.25

Solving
5x + -1x2 = 2.25

Solving for variable 'x'.

Reorder the terms:
-2.25 + 5x + -1x2 = 2.25 + -2.25

Combine like terms: 2.25 + -2.25 = 0.00
-2.25 + 5x + -1x2 = 0.00

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
2.25 + -5x + x2 = 0.00

Move the constant term to the right:

Add '-2.25' to each side of the equation.
2.25 + -5x + -2.25 + x2 = 0.00 + -2.25

Reorder the terms:
2.25 + -2.25 + -5x + x2 = 0.00 + -2.25

Combine like terms: 2.25 + -2.25 = 0.00
0.00 + -5x + x2 = 0.00 + -2.25
-5x + x2 = 0.00 + -2.25

Combine like terms: 0.00 + -2.25 = -2.25
-5x + x2 = -2.25

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 = -2.25 + 6.25

Reorder the terms:
6.25 + -5x + x2 = -2.25 + 6.25

Combine like terms: -2.25 + 6.25 = 4
6.25 + -5x + x2 = 4

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 4

Calculate the square root of the right side: 2

Break this problem into two subproblems by setting 
(x + -2.5) equal to 2 and -2.

Subproblem 1

x + -2.5 = 2 Simplifying x + -2.5 = 2 Reorder the terms: -2.5 + x = 2 Solving -2.5 + x = 2 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 = 2 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 2 + 2.5 x = 2 + 2.5 Combine like terms: 2 + 2.5 = 4.5 x = 4.5 Simplifying x = 4.5

Subproblem 2

x + -2.5 = -2 Simplifying x + -2.5 = -2 Reorder the terms: -2.5 + x = -2 Solving -2.5 + x = -2 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 = -2 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -2 + 2.5 x = -2 + 2.5 Combine like terms: -2 + 2.5 = 0.5 x = 0.5 Simplifying x = 0.5

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.5, 0.5}

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