X(4X+12)=75

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Solution for X(4X+12)=75 equation:


Simplifying
X(4X + 12) = 75

Reorder the terms:
X(12 + 4X) = 75
(12 * X + 4X * X) = 75
(12X + 4X2) = 75

Solving
12X + 4X2 = 75

Solving for variable 'X'.

Reorder the terms:
-75 + 12X + 4X2 = 75 + -75

Combine like terms: 75 + -75 = 0
-75 + 12X + 4X2 = 0

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

Divide each side by '4'.
-18.75 + 3X + X2 = 0

Move the constant term to the right:

Add '18.75' to each side of the equation.
-18.75 + 3X + 18.75 + X2 = 0 + 18.75

Reorder the terms:
-18.75 + 18.75 + 3X + X2 = 0 + 18.75

Combine like terms: -18.75 + 18.75 = 0.00
0.00 + 3X + X2 = 0 + 18.75
3X + X2 = 0 + 18.75

Combine like terms: 0 + 18.75 = 18.75
3X + X2 = 18.75

The X term is 3X.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3X + 2.25 + X2 = 18.75 + 2.25

Reorder the terms:
2.25 + 3X + X2 = 18.75 + 2.25

Combine like terms: 18.75 + 2.25 = 21
2.25 + 3X + X2 = 21

Factor a perfect square on the left side:
(X + 1.5)(X + 1.5) = 21

Calculate the square root of the right side: 4.582575695

Break this problem into two subproblems by setting 
(X + 1.5) equal to 4.582575695 and -4.582575695.

Subproblem 1

X + 1.5 = 4.582575695 Simplifying X + 1.5 = 4.582575695 Reorder the terms: 1.5 + X = 4.582575695 Solving 1.5 + X = 4.582575695 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + X = 4.582575695 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + X = 4.582575695 + -1.5 X = 4.582575695 + -1.5 Combine like terms: 4.582575695 + -1.5 = 3.082575695 X = 3.082575695 Simplifying X = 3.082575695

Subproblem 2

X + 1.5 = -4.582575695 Simplifying X + 1.5 = -4.582575695 Reorder the terms: 1.5 + X = -4.582575695 Solving 1.5 + X = -4.582575695 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + X = -4.582575695 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + X = -4.582575695 + -1.5 X = -4.582575695 + -1.5 Combine like terms: -4.582575695 + -1.5 = -6.082575695 X = -6.082575695 Simplifying X = -6.082575695

Solution

The solution to the problem is based on the solutions from the subproblems. X = {3.082575695, -6.082575695}

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