X*[2X+3]=100

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Solution for X*[2X+3]=100 equation:


Simplifying
X[2X + 3] = 100

Reorder the terms:
X[3 + 2X] = 100
[3 * X + 2X * X] = 100
[3X + 2X2] = 100

Solving
3X + 2X2 = 100

Solving for variable 'X'.

Reorder the terms:
-100 + 3X + 2X2 = 100 + -100

Combine like terms: 100 + -100 = 0
-100 + 3X + 2X2 = 0

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

Divide each side by '2'.
-50 + 1.5X + X2 = 0

Move the constant term to the right:

Add '50' to each side of the equation.
-50 + 1.5X + 50 + X2 = 0 + 50

Reorder the terms:
-50 + 50 + 1.5X + X2 = 0 + 50

Combine like terms: -50 + 50 = 0
0 + 1.5X + X2 = 0 + 50
1.5X + X2 = 0 + 50

Combine like terms: 0 + 50 = 50
1.5X + X2 = 50

The X term is 1.5X.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5X + 0.5625 + X2 = 50 + 0.5625

Reorder the terms:
0.5625 + 1.5X + X2 = 50 + 0.5625

Combine like terms: 50 + 0.5625 = 50.5625
0.5625 + 1.5X + X2 = 50.5625

Factor a perfect square on the left side:
(X + 0.75)(X + 0.75) = 50.5625

Calculate the square root of the right side: 7.110731327

Break this problem into two subproblems by setting 
(X + 0.75) equal to 7.110731327 and -7.110731327.

Subproblem 1

X + 0.75 = 7.110731327 Simplifying X + 0.75 = 7.110731327 Reorder the terms: 0.75 + X = 7.110731327 Solving 0.75 + X = 7.110731327 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + X = 7.110731327 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + X = 7.110731327 + -0.75 X = 7.110731327 + -0.75 Combine like terms: 7.110731327 + -0.75 = 6.360731327 X = 6.360731327 Simplifying X = 6.360731327

Subproblem 2

X + 0.75 = -7.110731327 Simplifying X + 0.75 = -7.110731327 Reorder the terms: 0.75 + X = -7.110731327 Solving 0.75 + X = -7.110731327 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + X = -7.110731327 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + X = -7.110731327 + -0.75 X = -7.110731327 + -0.75 Combine like terms: -7.110731327 + -0.75 = -7.860731327 X = -7.860731327 Simplifying X = -7.860731327

Solution

The solution to the problem is based on the solutions from the subproblems. X = {6.360731327, -7.860731327}

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