(1+x)(x+5)=280

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Solution for (1+x)(x+5)=280 equation:


Simplifying
(1 + x)(x + 5) = 280

Reorder the terms:
(1 + x)(5 + x) = 280

Multiply (1 + x) * (5 + x)
(1(5 + x) + x(5 + x)) = 280
((5 * 1 + x * 1) + x(5 + x)) = 280
((5 + 1x) + x(5 + x)) = 280
(5 + 1x + (5 * x + x * x)) = 280
(5 + 1x + (5x + x2)) = 280

Combine like terms: 1x + 5x = 6x
(5 + 6x + x2) = 280

Solving
5 + 6x + x2 = 280

Solving for variable 'x'.

Reorder the terms:
5 + -280 + 6x + x2 = 280 + -280

Combine like terms: 5 + -280 = -275
-275 + 6x + x2 = 280 + -280

Combine like terms: 280 + -280 = 0
-275 + 6x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '275' to each side of the equation.
-275 + 6x + 275 + x2 = 0 + 275

Reorder the terms:
-275 + 275 + 6x + x2 = 0 + 275

Combine like terms: -275 + 275 = 0
0 + 6x + x2 = 0 + 275
6x + x2 = 0 + 275

Combine like terms: 0 + 275 = 275
6x + x2 = 275

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 = 275 + 9

Reorder the terms:
9 + 6x + x2 = 275 + 9

Combine like terms: 275 + 9 = 284
9 + 6x + x2 = 284

Factor a perfect square on the left side:
(x + 3)(x + 3) = 284

Calculate the square root of the right side: 16.852299546

Break this problem into two subproblems by setting 
(x + 3) equal to 16.852299546 and -16.852299546.

Subproblem 1

x + 3 = 16.852299546 Simplifying x + 3 = 16.852299546 Reorder the terms: 3 + x = 16.852299546 Solving 3 + x = 16.852299546 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 = 16.852299546 + -3 Combine like terms: 3 + -3 = 0 0 + x = 16.852299546 + -3 x = 16.852299546 + -3 Combine like terms: 16.852299546 + -3 = 13.852299546 x = 13.852299546 Simplifying x = 13.852299546

Subproblem 2

x + 3 = -16.852299546 Simplifying x + 3 = -16.852299546 Reorder the terms: 3 + x = -16.852299546 Solving 3 + x = -16.852299546 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 = -16.852299546 + -3 Combine like terms: 3 + -3 = 0 0 + x = -16.852299546 + -3 x = -16.852299546 + -3 Combine like terms: -16.852299546 + -3 = -19.852299546 x = -19.852299546 Simplifying x = -19.852299546

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.852299546, -19.852299546}

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