x*x+1*x+2*x+3*x+4=720

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Solution for x*x+1*x+2*x+3*x+4=720 equation:


Simplifying
x * x + 1x + 2x + 3x + 4 = 720

Multiply x * x
x2 + 1x + 2x + 3x + 4 = 720

Reorder the terms:
4 + 1x + 2x + 3x + x2 = 720

Combine like terms: 1x + 2x = 3x
4 + 3x + 3x + x2 = 720

Combine like terms: 3x + 3x = 6x
4 + 6x + x2 = 720

Solving
4 + 6x + x2 = 720

Solving for variable 'x'.

Reorder the terms:
4 + -720 + 6x + x2 = 720 + -720

Combine like terms: 4 + -720 = -716
-716 + 6x + x2 = 720 + -720

Combine like terms: 720 + -720 = 0
-716 + 6x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '716' to each side of the equation.
-716 + 6x + 716 + x2 = 0 + 716

Reorder the terms:
-716 + 716 + 6x + x2 = 0 + 716

Combine like terms: -716 + 716 = 0
0 + 6x + x2 = 0 + 716
6x + x2 = 0 + 716

Combine like terms: 0 + 716 = 716
6x + x2 = 716

The x term is 6x.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6x + 9 + x2 = 716 + 9

Reorder the terms:
9 + 6x + x2 = 716 + 9

Combine like terms: 716 + 9 = 725
9 + 6x + x2 = 725

Factor a perfect square on the left side:
(x + 3)(x + 3) = 725

Calculate the square root of the right side: 26.925824036

Break this problem into two subproblems by setting 
(x + 3) equal to 26.925824036 and -26.925824036.

Subproblem 1

x + 3 = 26.925824036 Simplifying x + 3 = 26.925824036 Reorder the terms: 3 + x = 26.925824036 Solving 3 + x = 26.925824036 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 26.925824036 + -3 Combine like terms: 3 + -3 = 0 0 + x = 26.925824036 + -3 x = 26.925824036 + -3 Combine like terms: 26.925824036 + -3 = 23.925824036 x = 23.925824036 Simplifying x = 23.925824036

Subproblem 2

x + 3 = -26.925824036 Simplifying x + 3 = -26.925824036 Reorder the terms: 3 + x = -26.925824036 Solving 3 + x = -26.925824036 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = -26.925824036 + -3 Combine like terms: 3 + -3 = 0 0 + x = -26.925824036 + -3 x = -26.925824036 + -3 Combine like terms: -26.925824036 + -3 = -29.925824036 x = -29.925824036 Simplifying x = -29.925824036

Solution

The solution to the problem is based on the solutions from the subproblems. x = {23.925824036, -29.925824036}

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