2x(12+x)=75

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Solution for 2x(12+x)=75 equation:


Simplifying
2x(12 + x) = 75
(12 * 2x + x * 2x) = 75
(24x + 2x2) = 75

Solving
24x + 2x2 = 75

Solving for variable 'x'.

Reorder the terms:
-75 + 24x + 2x2 = 75 + -75

Combine like terms: 75 + -75 = 0
-75 + 24x + 2x2 = 0

Begin completing the square.  Divide all terms by
2 the coefficient of the squared term: 

Divide each side by '2'.
-37.5 + 12x + x2 = 0

Move the constant term to the right:

Add '37.5' to each side of the equation.
-37.5 + 12x + 37.5 + x2 = 0 + 37.5

Reorder the terms:
-37.5 + 37.5 + 12x + x2 = 0 + 37.5

Combine like terms: -37.5 + 37.5 = 0.0
0.0 + 12x + x2 = 0 + 37.5
12x + x2 = 0 + 37.5

Combine like terms: 0 + 37.5 = 37.5
12x + x2 = 37.5

The x term is 12x.  Take half its coefficient (6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
12x + 36 + x2 = 37.5 + 36

Reorder the terms:
36 + 12x + x2 = 37.5 + 36

Combine like terms: 37.5 + 36 = 73.5
36 + 12x + x2 = 73.5

Factor a perfect square on the left side:
(x + 6)(x + 6) = 73.5

Calculate the square root of the right side: 8.5732141

Break this problem into two subproblems by setting 
(x + 6) equal to 8.5732141 and -8.5732141.

Subproblem 1

x + 6 = 8.5732141 Simplifying x + 6 = 8.5732141 Reorder the terms: 6 + x = 8.5732141 Solving 6 + x = 8.5732141 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + x = 8.5732141 + -6 Combine like terms: 6 + -6 = 0 0 + x = 8.5732141 + -6 x = 8.5732141 + -6 Combine like terms: 8.5732141 + -6 = 2.5732141 x = 2.5732141 Simplifying x = 2.5732141

Subproblem 2

x + 6 = -8.5732141 Simplifying x + 6 = -8.5732141 Reorder the terms: 6 + x = -8.5732141 Solving 6 + x = -8.5732141 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + x = -8.5732141 + -6 Combine like terms: 6 + -6 = 0 0 + x = -8.5732141 + -6 x = -8.5732141 + -6 Combine like terms: -8.5732141 + -6 = -14.5732141 x = -14.5732141 Simplifying x = -14.5732141

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.5732141, -14.5732141}

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