756=450+0.5x(x+1)

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Solution for 756=450+0.5x(x+1) equation:


Simplifying
756 = 450 + 0.5x(x + 1)

Reorder the terms:
756 = 450 + 0.5x(1 + x)
756 = 450 + (1 * 0.5x + x * 0.5x)
756 = 450 + (0.5x + 0.5x2)

Solving
756 = 450 + 0.5x + 0.5x2

Solving for variable 'x'.

Combine like terms: 756 + -450 = 306
306 + -0.5x + -0.5x2 = 450 + 0.5x + 0.5x2 + -450 + -0.5x + -0.5x2

Reorder the terms:
306 + -0.5x + -0.5x2 = 450 + -450 + 0.5x + -0.5x + 0.5x2 + -0.5x2

Combine like terms: 450 + -450 = 0
306 + -0.5x + -0.5x2 = 0 + 0.5x + -0.5x + 0.5x2 + -0.5x2
306 + -0.5x + -0.5x2 = 0.5x + -0.5x + 0.5x2 + -0.5x2

Combine like terms: 0.5x + -0.5x = 0.0
306 + -0.5x + -0.5x2 = 0.0 + 0.5x2 + -0.5x2
306 + -0.5x + -0.5x2 = 0.5x2 + -0.5x2

Combine like terms: 0.5x2 + -0.5x2 = 0.0
306 + -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'.
-612 + x + x2 = 0

Move the constant term to the right:

Add '612' to each side of the equation.
-612 + x + 612 + x2 = 0 + 612

Reorder the terms:
-612 + 612 + x + x2 = 0 + 612

Combine like terms: -612 + 612 = 0
0 + x + x2 = 0 + 612
x + x2 = 0 + 612

Combine like terms: 0 + 612 = 612
x + x2 = 612

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 = 612 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 612 + 0.25

Combine like terms: 612 + 0.25 = 612.25
1.25 + x2 = 612.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 612.25

Calculate the square root of the right side: 24.743686063

Break this problem into two subproblems by setting 
(x + 0.5) equal to 24.743686063 and -24.743686063.

Subproblem 1

x + 0.5 = 24.743686063 Simplifying x + 0.5 = 24.743686063 Reorder the terms: 0.5 + x = 24.743686063 Solving 0.5 + x = 24.743686063 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 = 24.743686063 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 24.743686063 + -0.5 x = 24.743686063 + -0.5 Combine like terms: 24.743686063 + -0.5 = 24.243686063 x = 24.243686063 Simplifying x = 24.243686063

Subproblem 2

x + 0.5 = -24.743686063 Simplifying x + 0.5 = -24.743686063 Reorder the terms: 0.5 + x = -24.743686063 Solving 0.5 + x = -24.743686063 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 = -24.743686063 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -24.743686063 + -0.5 x = -24.743686063 + -0.5 Combine like terms: -24.743686063 + -0.5 = -25.243686063 x = -25.243686063 Simplifying x = -25.243686063

Solution

The solution to the problem is based on the solutions from the subproblems. x = {24.243686063, -25.243686063}

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