.5x^2+.5x=1275

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Solution for .5x^2+.5x=1275 equation:


Simplifying
0.5x2 + 0.5x = 1275

Reorder the terms:
0.5x + 0.5x2 = 1275

Solving
0.5x + 0.5x2 = 1275

Solving for variable 'x'.

Reorder the terms:
-1275 + 0.5x + 0.5x2 = 1275 + -1275

Combine like terms: 1275 + -1275 = 0
-1275 + 0.5x + 0.5x2 = 0

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

Divide each side by '0.5'.
-2550 + x + x2 = 0

Move the constant term to the right:

Add '2550' to each side of the equation.
-2550 + x + 2550 + x2 = 0 + 2550

Reorder the terms:
-2550 + 2550 + x + x2 = 0 + 2550

Combine like terms: -2550 + 2550 = 0
0 + x + x2 = 0 + 2550
x + x2 = 0 + 2550

Combine like terms: 0 + 2550 = 2550
x + x2 = 2550

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + x2 = 2550 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 2550 + 0.25

Combine like terms: 2550 + 0.25 = 2550.25
1.25 + x2 = 2550.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 2550.25

Calculate the square root of the right side: 50.5

Break this problem into two subproblems by setting 
(x + 0.5) equal to 50.5 and -50.5.

Subproblem 1

x + 0.5 = 50.5 Simplifying x + 0.5 = 50.5 Reorder the terms: 0.5 + x = 50.5 Solving 0.5 + x = 50.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 50.5 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 50.5 + -0.5 x = 50.5 + -0.5 Combine like terms: 50.5 + -0.5 = 50 x = 50 Simplifying x = 50

Subproblem 2

x + 0.5 = -50.5 Simplifying x + 0.5 = -50.5 Reorder the terms: 0.5 + x = -50.5 Solving 0.5 + x = -50.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -50.5 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -50.5 + -0.5 x = -50.5 + -0.5 Combine like terms: -50.5 + -0.5 = -51 x = -51 Simplifying x = -51

Solution

The solution to the problem is based on the solutions from the subproblems. x = {50, -51}

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