x*(x+1)=291

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Solution for x*(x+1)=291 equation:


Simplifying
x(x + 1) = 291

Reorder the terms:
x(1 + x) = 291
(1 * x + x * x) = 291
(1x + x2) = 291

Solving
1x + x2 = 291

Solving for variable 'x'.

Reorder the terms:
-291 + 1x + x2 = 291 + -291

Combine like terms: 291 + -291 = 0
-291 + 1x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '291' to each side of the equation.
-291 + 1x + 291 + x2 = 0 + 291

Reorder the terms:
-291 + 291 + 1x + x2 = 0 + 291

Combine like terms: -291 + 291 = 0
0 + 1x + x2 = 0 + 291
1x + x2 = 0 + 291

Combine like terms: 0 + 291 = 291
1x + x2 = 291

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 = 291 + 0.25

Reorder the terms:
0.25 + x + x2 = 291 + 0.25

Combine like terms: 291 + 0.25 = 291.25
0.25 + x + x2 = 291.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 291.25

Calculate the square root of the right side: 17.066048166

Break this problem into two subproblems by setting 
(x + 0.5) equal to 17.066048166 and -17.066048166.

Subproblem 1

x + 0.5 = 17.066048166 Simplifying x + 0.5 = 17.066048166 Reorder the terms: 0.5 + x = 17.066048166 Solving 0.5 + x = 17.066048166 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 = 17.066048166 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 17.066048166 + -0.5 x = 17.066048166 + -0.5 Combine like terms: 17.066048166 + -0.5 = 16.566048166 x = 16.566048166 Simplifying x = 16.566048166

Subproblem 2

x + 0.5 = -17.066048166 Simplifying x + 0.5 = -17.066048166 Reorder the terms: 0.5 + x = -17.066048166 Solving 0.5 + x = -17.066048166 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 = -17.066048166 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -17.066048166 + -0.5 x = -17.066048166 + -0.5 Combine like terms: -17.066048166 + -0.5 = -17.566048166 x = -17.566048166 Simplifying x = -17.566048166

Solution

The solution to the problem is based on the solutions from the subproblems. x = {16.566048166, -17.566048166}

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