741=.5x^2+.5x

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Solution for 741=.5x^2+.5x equation:


Simplifying
741 = 0.5x2 + 0.5x

Reorder the terms:
741 = 0.5x + 0.5x2

Solving
741 = 0.5x + 0.5x2

Solving for variable 'x'.

Reorder the terms:
741 + -0.5x + -0.5x2 = 0.5x + -0.5x + 0.5x2 + -0.5x2

Combine like terms: 0.5x + -0.5x = 0.0
741 + -0.5x + -0.5x2 = 0.0 + 0.5x2 + -0.5x2
741 + -0.5x + -0.5x2 = 0.5x2 + -0.5x2

Combine like terms: 0.5x2 + -0.5x2 = 0.0
741 + -0.5x + -0.5x2 = 0.0

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

Divide each side by '-0.5'.
-1482 + x + x2 = 0

Move the constant term to the right:

Add '1482' to each side of the equation.
-1482 + x + 1482 + x2 = 0 + 1482

Reorder the terms:
-1482 + 1482 + x + x2 = 0 + 1482

Combine like terms: -1482 + 1482 = 0
0 + x + x2 = 0 + 1482
x + x2 = 0 + 1482

Combine like terms: 0 + 1482 = 1482
x + x2 = 1482

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 = 1482 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 1482 + 0.25

Combine like terms: 1482 + 0.25 = 1482.25
1.25 + x2 = 1482.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 1482.25

Calculate the square root of the right side: 38.5

Break this problem into two subproblems by setting 
(x + 0.5) equal to 38.5 and -38.5.

Subproblem 1

x + 0.5 = 38.5 Simplifying x + 0.5 = 38.5 Reorder the terms: 0.5 + x = 38.5 Solving 0.5 + x = 38.5 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 = 38.5 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 38.5 + -0.5 x = 38.5 + -0.5 Combine like terms: 38.5 + -0.5 = 38 x = 38 Simplifying x = 38

Subproblem 2

x + 0.5 = -38.5 Simplifying x + 0.5 = -38.5 Reorder the terms: 0.5 + x = -38.5 Solving 0.5 + x = -38.5 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 = -38.5 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -38.5 + -0.5 x = -38.5 + -0.5 Combine like terms: -38.5 + -0.5 = -39 x = -39 Simplifying x = -39

Solution

The solution to the problem is based on the solutions from the subproblems. x = {38, -39}

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