(x+3)(x+11)=57

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Solution for (x+3)(x+11)=57 equation:


Simplifying
(x + 3)(x + 11) = 57

Reorder the terms:
(3 + x)(x + 11) = 57

Reorder the terms:
(3 + x)(11 + x) = 57

Multiply (3 + x) * (11 + x)
(3(11 + x) + x(11 + x)) = 57
((11 * 3 + x * 3) + x(11 + x)) = 57
((33 + 3x) + x(11 + x)) = 57
(33 + 3x + (11 * x + x * x)) = 57
(33 + 3x + (11x + x2)) = 57

Combine like terms: 3x + 11x = 14x
(33 + 14x + x2) = 57

Solving
33 + 14x + x2 = 57

Solving for variable 'x'.

Reorder the terms:
33 + -57 + 14x + x2 = 57 + -57

Combine like terms: 33 + -57 = -24
-24 + 14x + x2 = 57 + -57

Combine like terms: 57 + -57 = 0
-24 + 14x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '24' to each side of the equation.
-24 + 14x + 24 + x2 = 0 + 24

Reorder the terms:
-24 + 24 + 14x + x2 = 0 + 24

Combine like terms: -24 + 24 = 0
0 + 14x + x2 = 0 + 24
14x + x2 = 0 + 24

Combine like terms: 0 + 24 = 24
14x + x2 = 24

The x term is 14x.  Take half its coefficient (7).
Square it (49) and add it to both sides.

Add '49' to each side of the equation.
14x + 49 + x2 = 24 + 49

Reorder the terms:
49 + 14x + x2 = 24 + 49

Combine like terms: 24 + 49 = 73
49 + 14x + x2 = 73

Factor a perfect square on the left side:
(x + 7)(x + 7) = 73

Calculate the square root of the right side: 8.544003745

Break this problem into two subproblems by setting 
(x + 7) equal to 8.544003745 and -8.544003745.

Subproblem 1

x + 7 = 8.544003745 Simplifying x + 7 = 8.544003745 Reorder the terms: 7 + x = 8.544003745 Solving 7 + x = 8.544003745 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + x = 8.544003745 + -7 Combine like terms: 7 + -7 = 0 0 + x = 8.544003745 + -7 x = 8.544003745 + -7 Combine like terms: 8.544003745 + -7 = 1.544003745 x = 1.544003745 Simplifying x = 1.544003745

Subproblem 2

x + 7 = -8.544003745 Simplifying x + 7 = -8.544003745 Reorder the terms: 7 + x = -8.544003745 Solving 7 + x = -8.544003745 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + x = -8.544003745 + -7 Combine like terms: 7 + -7 = 0 0 + x = -8.544003745 + -7 x = -8.544003745 + -7 Combine like terms: -8.544003745 + -7 = -15.544003745 x = -15.544003745 Simplifying x = -15.544003745

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.544003745, -15.544003745}

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