=3x^2+7x-2

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Solution for =3x^2+7x-2 equation:


Simplifying
0 = 3x2 + 7x + -2

Reorder the terms:
0 = -2 + 7x + 3x2

Solving
0 = -2 + 7x + 3x2

Solving for variable 'x'.

Combine like terms: 0 + 2 = 2
2 + -7x + -3x2 = -2 + 7x + 3x2 + 2 + -7x + -3x2

Reorder the terms:
2 + -7x + -3x2 = -2 + 2 + 7x + -7x + 3x2 + -3x2

Combine like terms: -2 + 2 = 0
2 + -7x + -3x2 = 0 + 7x + -7x + 3x2 + -3x2
2 + -7x + -3x2 = 7x + -7x + 3x2 + -3x2

Combine like terms: 7x + -7x = 0
2 + -7x + -3x2 = 0 + 3x2 + -3x2
2 + -7x + -3x2 = 3x2 + -3x2

Combine like terms: 3x2 + -3x2 = 0
2 + -7x + -3x2 = 0

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

Divide each side by '-3'.
-0.6666666667 + 2.333333333x + x2 = 0

Move the constant term to the right:

Add '0.6666666667' to each side of the equation.
-0.6666666667 + 2.333333333x + 0.6666666667 + x2 = 0 + 0.6666666667

Reorder the terms:
-0.6666666667 + 0.6666666667 + 2.333333333x + x2 = 0 + 0.6666666667

Combine like terms: -0.6666666667 + 0.6666666667 = 0.0000000000
0.0000000000 + 2.333333333x + x2 = 0 + 0.6666666667
2.333333333x + x2 = 0 + 0.6666666667

Combine like terms: 0 + 0.6666666667 = 0.6666666667
2.333333333x + x2 = 0.6666666667

The x term is 2.333333333x.  Take half its coefficient (1.166666667).
Square it (1.361111112) and add it to both sides.

Add '1.361111112' to each side of the equation.
2.333333333x + 1.361111112 + x2 = 0.6666666667 + 1.361111112

Reorder the terms:
1.361111112 + 2.333333333x + x2 = 0.6666666667 + 1.361111112

Combine like terms: 0.6666666667 + 1.361111112 = 2.0277777787
1.361111112 + 2.333333333x + x2 = 2.0277777787

Factor a perfect square on the left side:
(x + 1.166666667)(x + 1.166666667) = 2.0277777787

Calculate the square root of the right side: 1.424000625

Break this problem into two subproblems by setting 
(x + 1.166666667) equal to 1.424000625 and -1.424000625.

Subproblem 1

x + 1.166666667 = 1.424000625 Simplifying x + 1.166666667 = 1.424000625 Reorder the terms: 1.166666667 + x = 1.424000625 Solving 1.166666667 + x = 1.424000625 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.166666667' to each side of the equation. 1.166666667 + -1.166666667 + x = 1.424000625 + -1.166666667 Combine like terms: 1.166666667 + -1.166666667 = 0.000000000 0.000000000 + x = 1.424000625 + -1.166666667 x = 1.424000625 + -1.166666667 Combine like terms: 1.424000625 + -1.166666667 = 0.257333958 x = 0.257333958 Simplifying x = 0.257333958

Subproblem 2

x + 1.166666667 = -1.424000625 Simplifying x + 1.166666667 = -1.424000625 Reorder the terms: 1.166666667 + x = -1.424000625 Solving 1.166666667 + x = -1.424000625 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.166666667' to each side of the equation. 1.166666667 + -1.166666667 + x = -1.424000625 + -1.166666667 Combine like terms: 1.166666667 + -1.166666667 = 0.000000000 0.000000000 + x = -1.424000625 + -1.166666667 x = -1.424000625 + -1.166666667 Combine like terms: -1.424000625 + -1.166666667 = -2.590667292 x = -2.590667292 Simplifying x = -2.590667292

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.257333958, -2.590667292}

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