(3x^2+4x)+(2x^2+9x-1)=

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Solution for (3x^2+4x)+(2x^2+9x-1)= equation:


Simplifying
(3x2 + 4x) + (2x2 + 9x + -1) = 0

Reorder the terms:
(4x + 3x2) + (2x2 + 9x + -1) = 0

Remove parenthesis around (4x + 3x2)
4x + 3x2 + (2x2 + 9x + -1) = 0

Reorder the terms:
4x + 3x2 + (-1 + 9x + 2x2) = 0

Remove parenthesis around (-1 + 9x + 2x2)
4x + 3x2 + -1 + 9x + 2x2 = 0

Reorder the terms:
-1 + 4x + 9x + 3x2 + 2x2 = 0

Combine like terms: 4x + 9x = 13x
-1 + 13x + 3x2 + 2x2 = 0

Combine like terms: 3x2 + 2x2 = 5x2
-1 + 13x + 5x2 = 0

Solving
-1 + 13x + 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'.
-0.2 + 2.6x + x2 = 0

Move the constant term to the right:

Add '0.2' to each side of the equation.
-0.2 + 2.6x + 0.2 + x2 = 0 + 0.2

Reorder the terms:
-0.2 + 0.2 + 2.6x + x2 = 0 + 0.2

Combine like terms: -0.2 + 0.2 = 0.0
0.0 + 2.6x + x2 = 0 + 0.2
2.6x + x2 = 0 + 0.2

Combine like terms: 0 + 0.2 = 0.2
2.6x + x2 = 0.2

The x term is 2.6x.  Take half its coefficient (1.3).
Square it (1.69) and add it to both sides.

Add '1.69' to each side of the equation.
2.6x + 1.69 + x2 = 0.2 + 1.69

Reorder the terms:
1.69 + 2.6x + x2 = 0.2 + 1.69

Combine like terms: 0.2 + 1.69 = 1.89
1.69 + 2.6x + x2 = 1.89

Factor a perfect square on the left side:
(x + 1.3)(x + 1.3) = 1.89

Calculate the square root of the right side: 1.374772708

Break this problem into two subproblems by setting 
(x + 1.3) equal to 1.374772708 and -1.374772708.

Subproblem 1

x + 1.3 = 1.374772708 Simplifying x + 1.3 = 1.374772708 Reorder the terms: 1.3 + x = 1.374772708 Solving 1.3 + x = 1.374772708 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.3' to each side of the equation. 1.3 + -1.3 + x = 1.374772708 + -1.3 Combine like terms: 1.3 + -1.3 = 0.0 0.0 + x = 1.374772708 + -1.3 x = 1.374772708 + -1.3 Combine like terms: 1.374772708 + -1.3 = 0.074772708 x = 0.074772708 Simplifying x = 0.074772708

Subproblem 2

x + 1.3 = -1.374772708 Simplifying x + 1.3 = -1.374772708 Reorder the terms: 1.3 + x = -1.374772708 Solving 1.3 + x = -1.374772708 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.3' to each side of the equation. 1.3 + -1.3 + x = -1.374772708 + -1.3 Combine like terms: 1.3 + -1.3 = 0.0 0.0 + x = -1.374772708 + -1.3 x = -1.374772708 + -1.3 Combine like terms: -1.374772708 + -1.3 = -2.674772708 x = -2.674772708 Simplifying x = -2.674772708

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.074772708, -2.674772708}

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