3x^2+10x-18=0

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Solution for 3x^2+10x-18=0 equation:


Simplifying
3x2 + 10x + -18 = 0

Reorder the terms:
-18 + 10x + 3x2 = 0

Solving
-18 + 10x + 3x2 = 0

Solving for variable 'x'.

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

Divide each side by '3'.
-6 + 3.333333333x + x2 = 0

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + 3.333333333x + 6 + x2 = 0 + 6

Reorder the terms:
-6 + 6 + 3.333333333x + x2 = 0 + 6

Combine like terms: -6 + 6 = 0
0 + 3.333333333x + x2 = 0 + 6
3.333333333x + x2 = 0 + 6

Combine like terms: 0 + 6 = 6
3.333333333x + x2 = 6

The x term is 3.333333333x.  Take half its coefficient (1.666666667).
Square it (2.777777779) and add it to both sides.

Add '2.777777779' to each side of the equation.
3.333333333x + 2.777777779 + x2 = 6 + 2.777777779

Reorder the terms:
2.777777779 + 3.333333333x + x2 = 6 + 2.777777779

Combine like terms: 6 + 2.777777779 = 8.777777779
2.777777779 + 3.333333333x + x2 = 8.777777779

Factor a perfect square on the left side:
(x + 1.666666667)(x + 1.666666667) = 8.777777779

Calculate the square root of the right side: 2.962731473

Break this problem into two subproblems by setting 
(x + 1.666666667) equal to 2.962731473 and -2.962731473.

Subproblem 1

x + 1.666666667 = 2.962731473 Simplifying x + 1.666666667 = 2.962731473 Reorder the terms: 1.666666667 + x = 2.962731473 Solving 1.666666667 + x = 2.962731473 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.666666667' to each side of the equation. 1.666666667 + -1.666666667 + x = 2.962731473 + -1.666666667 Combine like terms: 1.666666667 + -1.666666667 = 0.000000000 0.000000000 + x = 2.962731473 + -1.666666667 x = 2.962731473 + -1.666666667 Combine like terms: 2.962731473 + -1.666666667 = 1.296064806 x = 1.296064806 Simplifying x = 1.296064806

Subproblem 2

x + 1.666666667 = -2.962731473 Simplifying x + 1.666666667 = -2.962731473 Reorder the terms: 1.666666667 + x = -2.962731473 Solving 1.666666667 + x = -2.962731473 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.666666667' to each side of the equation. 1.666666667 + -1.666666667 + x = -2.962731473 + -1.666666667 Combine like terms: 1.666666667 + -1.666666667 = 0.000000000 0.000000000 + x = -2.962731473 + -1.666666667 x = -2.962731473 + -1.666666667 Combine like terms: -2.962731473 + -1.666666667 = -4.62939814 x = -4.62939814 Simplifying x = -4.62939814

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.296064806, -4.62939814}

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