(x+5)(x+2)=355

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Solution for (x+5)(x+2)=355 equation:


Simplifying
(x + 5)(x + 2) = 355

Reorder the terms:
(5 + x)(x + 2) = 355

Reorder the terms:
(5 + x)(2 + x) = 355

Multiply (5 + x) * (2 + x)
(5(2 + x) + x(2 + x)) = 355
((2 * 5 + x * 5) + x(2 + x)) = 355
((10 + 5x) + x(2 + x)) = 355
(10 + 5x + (2 * x + x * x)) = 355
(10 + 5x + (2x + x2)) = 355

Combine like terms: 5x + 2x = 7x
(10 + 7x + x2) = 355

Solving
10 + 7x + x2 = 355

Solving for variable 'x'.

Reorder the terms:
10 + -355 + 7x + x2 = 355 + -355

Combine like terms: 10 + -355 = -345
-345 + 7x + x2 = 355 + -355

Combine like terms: 355 + -355 = 0
-345 + 7x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '345' to each side of the equation.
-345 + 7x + 345 + x2 = 0 + 345

Reorder the terms:
-345 + 345 + 7x + x2 = 0 + 345

Combine like terms: -345 + 345 = 0
0 + 7x + x2 = 0 + 345
7x + x2 = 0 + 345

Combine like terms: 0 + 345 = 345
7x + x2 = 345

The x term is 7x.  Take half its coefficient (3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
7x + 12.25 + x2 = 345 + 12.25

Reorder the terms:
12.25 + 7x + x2 = 345 + 12.25

Combine like terms: 345 + 12.25 = 357.25
12.25 + 7x + x2 = 357.25

Factor a perfect square on the left side:
(x + 3.5)(x + 3.5) = 357.25

Calculate the square root of the right side: 18.901058171

Break this problem into two subproblems by setting 
(x + 3.5) equal to 18.901058171 and -18.901058171.

Subproblem 1

x + 3.5 = 18.901058171 Simplifying x + 3.5 = 18.901058171 Reorder the terms: 3.5 + x = 18.901058171 Solving 3.5 + x = 18.901058171 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = 18.901058171 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = 18.901058171 + -3.5 x = 18.901058171 + -3.5 Combine like terms: 18.901058171 + -3.5 = 15.401058171 x = 15.401058171 Simplifying x = 15.401058171

Subproblem 2

x + 3.5 = -18.901058171 Simplifying x + 3.5 = -18.901058171 Reorder the terms: 3.5 + x = -18.901058171 Solving 3.5 + x = -18.901058171 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = -18.901058171 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = -18.901058171 + -3.5 x = -18.901058171 + -3.5 Combine like terms: -18.901058171 + -3.5 = -22.401058171 x = -22.401058171 Simplifying x = -22.401058171

Solution

The solution to the problem is based on the solutions from the subproblems. x = {15.401058171, -22.401058171}

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