(3x^2-5x+4)+(7x^2-x-9)=

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Solution for (3x^2-5x+4)+(7x^2-x-9)= equation:


Simplifying
(3x2 + -5x + 4) + (7x2 + -1x + -9) = 0

Reorder the terms:
(4 + -5x + 3x2) + (7x2 + -1x + -9) = 0

Remove parenthesis around (4 + -5x + 3x2)
4 + -5x + 3x2 + (7x2 + -1x + -9) = 0

Reorder the terms:
4 + -5x + 3x2 + (-9 + -1x + 7x2) = 0

Remove parenthesis around (-9 + -1x + 7x2)
4 + -5x + 3x2 + -9 + -1x + 7x2 = 0

Reorder the terms:
4 + -9 + -5x + -1x + 3x2 + 7x2 = 0

Combine like terms: 4 + -9 = -5
-5 + -5x + -1x + 3x2 + 7x2 = 0

Combine like terms: -5x + -1x = -6x
-5 + -6x + 3x2 + 7x2 = 0

Combine like terms: 3x2 + 7x2 = 10x2
-5 + -6x + 10x2 = 0

Solving
-5 + -6x + 10x2 = 0

Solving for variable 'x'.

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

Divide each side by '10'.
-0.5 + -0.6x + x2 = 0.0

Move the constant term to the right:

Add '0.5' to each side of the equation.
-0.5 + -0.6x + 0.5 + x2 = 0.0 + 0.5

Reorder the terms:
-0.5 + 0.5 + -0.6x + x2 = 0.0 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + -0.6x + x2 = 0.0 + 0.5
-0.6x + x2 = 0.0 + 0.5

Combine like terms: 0.0 + 0.5 = 0.5
-0.6x + x2 = 0.5

The x term is -0.6x.  Take half its coefficient (-0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
-0.6x + 0.09 + x2 = 0.5 + 0.09

Reorder the terms:
0.09 + -0.6x + x2 = 0.5 + 0.09

Combine like terms: 0.5 + 0.09 = 0.59
0.09 + -0.6x + x2 = 0.59

Factor a perfect square on the left side:
(x + -0.3)(x + -0.3) = 0.59

Calculate the square root of the right side: 0.768114575

Break this problem into two subproblems by setting 
(x + -0.3) equal to 0.768114575 and -0.768114575.

Subproblem 1

x + -0.3 = 0.768114575 Simplifying x + -0.3 = 0.768114575 Reorder the terms: -0.3 + x = 0.768114575 Solving -0.3 + x = 0.768114575 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3' to each side of the equation. -0.3 + 0.3 + x = 0.768114575 + 0.3 Combine like terms: -0.3 + 0.3 = 0.0 0.0 + x = 0.768114575 + 0.3 x = 0.768114575 + 0.3 Combine like terms: 0.768114575 + 0.3 = 1.068114575 x = 1.068114575 Simplifying x = 1.068114575

Subproblem 2

x + -0.3 = -0.768114575 Simplifying x + -0.3 = -0.768114575 Reorder the terms: -0.3 + x = -0.768114575 Solving -0.3 + x = -0.768114575 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3' to each side of the equation. -0.3 + 0.3 + x = -0.768114575 + 0.3 Combine like terms: -0.3 + 0.3 = 0.0 0.0 + x = -0.768114575 + 0.3 x = -0.768114575 + 0.3 Combine like terms: -0.768114575 + 0.3 = -0.468114575 x = -0.468114575 Simplifying x = -0.468114575

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.068114575, -0.468114575}

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