3(X^2-1)-2(X^2+2X)=5

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Solution for 3(X^2-1)-2(X^2+2X)=5 equation:


Simplifying
3(X2 + -1) + -2(X2 + 2X) = 5

Reorder the terms:
3(-1 + X2) + -2(X2 + 2X) = 5
(-1 * 3 + X2 * 3) + -2(X2 + 2X) = 5
(-3 + 3X2) + -2(X2 + 2X) = 5

Reorder the terms:
-3 + 3X2 + -2(2X + X2) = 5
-3 + 3X2 + (2X * -2 + X2 * -2) = 5
-3 + 3X2 + (-4X + -2X2) = 5

Reorder the terms:
-3 + -4X + 3X2 + -2X2 = 5

Combine like terms: 3X2 + -2X2 = 1X2
-3 + -4X + 1X2 = 5

Solving
-3 + -4X + 1X2 = 5

Solving for variable 'X'.

Reorder the terms:
-3 + -5 + -4X + 1X2 = 5 + -5

Combine like terms: -3 + -5 = -8
-8 + -4X + 1X2 = 5 + -5

Combine like terms: 5 + -5 = 0
-8 + -4X + 1X2 = 0

Begin completing the square.

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + -4X + 8 + X2 = 0 + 8

Reorder the terms:
-8 + 8 + -4X + X2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + -4X + X2 = 0 + 8
-4X + X2 = 0 + 8

Combine like terms: 0 + 8 = 8
-4X + X2 = 8

The X term is -4X.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4X + 4 + X2 = 8 + 4

Reorder the terms:
4 + -4X + X2 = 8 + 4

Combine like terms: 8 + 4 = 12
4 + -4X + X2 = 12

Factor a perfect square on the left side:
(X + -2)(X + -2) = 12

Calculate the square root of the right side: 3.464101615

Break this problem into two subproblems by setting 
(X + -2) equal to 3.464101615 and -3.464101615.

Subproblem 1

X + -2 = 3.464101615 Simplifying X + -2 = 3.464101615 Reorder the terms: -2 + X = 3.464101615 Solving -2 + X = 3.464101615 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + X = 3.464101615 + 2 Combine like terms: -2 + 2 = 0 0 + X = 3.464101615 + 2 X = 3.464101615 + 2 Combine like terms: 3.464101615 + 2 = 5.464101615 X = 5.464101615 Simplifying X = 5.464101615

Subproblem 2

X + -2 = -3.464101615 Simplifying X + -2 = -3.464101615 Reorder the terms: -2 + X = -3.464101615 Solving -2 + X = -3.464101615 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + X = -3.464101615 + 2 Combine like terms: -2 + 2 = 0 0 + X = -3.464101615 + 2 X = -3.464101615 + 2 Combine like terms: -3.464101615 + 2 = -1.464101615 X = -1.464101615 Simplifying X = -1.464101615

Solution

The solution to the problem is based on the solutions from the subproblems. X = {5.464101615, -1.464101615}

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