5X^2+12X-18=0

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Solution for 5X^2+12X-18=0 equation:


Simplifying
5X2 + 12X + -18 = 0

Reorder the terms:
-18 + 12X + 5X2 = 0

Solving
-18 + 12X + 5X2 = 0

Solving for variable 'X'.

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

Divide each side by '5'.
-3.6 + 2.4X + X2 = 0

Move the constant term to the right:

Add '3.6' to each side of the equation.
-3.6 + 2.4X + 3.6 + X2 = 0 + 3.6

Reorder the terms:
-3.6 + 3.6 + 2.4X + X2 = 0 + 3.6

Combine like terms: -3.6 + 3.6 = 0.0
0.0 + 2.4X + X2 = 0 + 3.6
2.4X + X2 = 0 + 3.6

Combine like terms: 0 + 3.6 = 3.6
2.4X + X2 = 3.6

The X term is 2.4X.  Take half its coefficient (1.2).
Square it (1.44) and add it to both sides.

Add '1.44' to each side of the equation.
2.4X + 1.44 + X2 = 3.6 + 1.44

Reorder the terms:
1.44 + 2.4X + X2 = 3.6 + 1.44

Combine like terms: 3.6 + 1.44 = 5.04
1.44 + 2.4X + X2 = 5.04

Factor a perfect square on the left side:
(X + 1.2)(X + 1.2) = 5.04

Calculate the square root of the right side: 2.244994432

Break this problem into two subproblems by setting 
(X + 1.2) equal to 2.244994432 and -2.244994432.

Subproblem 1

X + 1.2 = 2.244994432 Simplifying X + 1.2 = 2.244994432 Reorder the terms: 1.2 + X = 2.244994432 Solving 1.2 + X = 2.244994432 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-1.2' to each side of the equation. 1.2 + -1.2 + X = 2.244994432 + -1.2 Combine like terms: 1.2 + -1.2 = 0.0 0.0 + X = 2.244994432 + -1.2 X = 2.244994432 + -1.2 Combine like terms: 2.244994432 + -1.2 = 1.044994432 X = 1.044994432 Simplifying X = 1.044994432

Subproblem 2

X + 1.2 = -2.244994432 Simplifying X + 1.2 = -2.244994432 Reorder the terms: 1.2 + X = -2.244994432 Solving 1.2 + X = -2.244994432 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-1.2' to each side of the equation. 1.2 + -1.2 + X = -2.244994432 + -1.2 Combine like terms: 1.2 + -1.2 = 0.0 0.0 + X = -2.244994432 + -1.2 X = -2.244994432 + -1.2 Combine like terms: -2.244994432 + -1.2 = -3.444994432 X = -3.444994432 Simplifying X = -3.444994432

Solution

The solution to the problem is based on the solutions from the subproblems. X = {1.044994432, -3.444994432}

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