x(x+1)=675

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Solution for x(x+1)=675 equation:


Simplifying
x(x + 1) = 675

Reorder the terms:
x(1 + x) = 675
(1 * x + x * x) = 675
(1x + x2) = 675

Solving
1x + x2 = 675

Solving for variable 'x'.

Reorder the terms:
-675 + 1x + x2 = 675 + -675

Combine like terms: 675 + -675 = 0
-675 + 1x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '675' to each side of the equation.
-675 + 1x + 675 + x2 = 0 + 675

Reorder the terms:
-675 + 675 + 1x + x2 = 0 + 675

Combine like terms: -675 + 675 = 0
0 + 1x + x2 = 0 + 675
1x + x2 = 0 + 675

Combine like terms: 0 + 675 = 675
1x + x2 = 675

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 = 675 + 0.25

Reorder the terms:
0.25 + x + x2 = 675 + 0.25

Combine like terms: 675 + 0.25 = 675.25
0.25 + x + x2 = 675.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 675.25

Calculate the square root of the right side: 25.98557292

Break this problem into two subproblems by setting 
(x + 0.5) equal to 25.98557292 and -25.98557292.

Subproblem 1

x + 0.5 = 25.98557292 Simplifying x + 0.5 = 25.98557292 Reorder the terms: 0.5 + x = 25.98557292 Solving 0.5 + x = 25.98557292 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 = 25.98557292 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 25.98557292 + -0.5 x = 25.98557292 + -0.5 Combine like terms: 25.98557292 + -0.5 = 25.48557292 x = 25.48557292 Simplifying x = 25.48557292

Subproblem 2

x + 0.5 = -25.98557292 Simplifying x + 0.5 = -25.98557292 Reorder the terms: 0.5 + x = -25.98557292 Solving 0.5 + x = -25.98557292 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 = -25.98557292 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -25.98557292 + -0.5 x = -25.98557292 + -0.5 Combine like terms: -25.98557292 + -0.5 = -26.48557292 x = -26.48557292 Simplifying x = -26.48557292

Solution

The solution to the problem is based on the solutions from the subproblems. x = {25.48557292, -26.48557292}

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