x(x+1)=450

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


Simplifying
x(x + 1) = 450

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

Solving
1x + x2 = 450

Solving for variable 'x'.

Reorder the terms:
-450 + 1x + x2 = 450 + -450

Combine like terms: 450 + -450 = 0
-450 + 1x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '450' to each side of the equation.
-450 + 1x + 450 + x2 = 0 + 450

Reorder the terms:
-450 + 450 + 1x + x2 = 0 + 450

Combine like terms: -450 + 450 = 0
0 + 1x + x2 = 0 + 450
1x + x2 = 0 + 450

Combine like terms: 0 + 450 = 450
1x + x2 = 450

The x term is 1x.  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.
x + 0.25 + x2 = 450 + 0.25

Reorder the terms:
0.25 + x + x2 = 450 + 0.25

Combine like terms: 450 + 0.25 = 450.25
0.25 + x + x2 = 450.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 450.25

Calculate the square root of the right side: 21.219095174

Break this problem into two subproblems by setting 
(x + 0.5) equal to 21.219095174 and -21.219095174.

Subproblem 1

x + 0.5 = 21.219095174 Simplifying x + 0.5 = 21.219095174 Reorder the terms: 0.5 + x = 21.219095174 Solving 0.5 + x = 21.219095174 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 = 21.219095174 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 21.219095174 + -0.5 x = 21.219095174 + -0.5 Combine like terms: 21.219095174 + -0.5 = 20.719095174 x = 20.719095174 Simplifying x = 20.719095174

Subproblem 2

x + 0.5 = -21.219095174 Simplifying x + 0.5 = -21.219095174 Reorder the terms: 0.5 + x = -21.219095174 Solving 0.5 + x = -21.219095174 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 = -21.219095174 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -21.219095174 + -0.5 x = -21.219095174 + -0.5 Combine like terms: -21.219095174 + -0.5 = -21.719095174 x = -21.719095174 Simplifying x = -21.719095174

Solution

The solution to the problem is based on the solutions from the subproblems. x = {20.719095174, -21.719095174}

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