(7x^2+10x+2)+(3x^2-12x-5)=

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Solution for (7x^2+10x+2)+(3x^2-12x-5)= equation:


Simplifying
(7x2 + 10x + 2) + (3x2 + -12x + -5) = 0

Reorder the terms:
(2 + 10x + 7x2) + (3x2 + -12x + -5) = 0

Remove parenthesis around (2 + 10x + 7x2)
2 + 10x + 7x2 + (3x2 + -12x + -5) = 0

Reorder the terms:
2 + 10x + 7x2 + (-5 + -12x + 3x2) = 0

Remove parenthesis around (-5 + -12x + 3x2)
2 + 10x + 7x2 + -5 + -12x + 3x2 = 0

Reorder the terms:
2 + -5 + 10x + -12x + 7x2 + 3x2 = 0

Combine like terms: 2 + -5 = -3
-3 + 10x + -12x + 7x2 + 3x2 = 0

Combine like terms: 10x + -12x = -2x
-3 + -2x + 7x2 + 3x2 = 0

Combine like terms: 7x2 + 3x2 = 10x2
-3 + -2x + 10x2 = 0

Solving
-3 + -2x + 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'.
-0.3 + -0.2x + x2 = 0.0

Move the constant term to the right:

Add '0.3' to each side of the equation.
-0.3 + -0.2x + 0.3 + x2 = 0.0 + 0.3

Reorder the terms:
-0.3 + 0.3 + -0.2x + x2 = 0.0 + 0.3

Combine like terms: -0.3 + 0.3 = 0.0
0.0 + -0.2x + x2 = 0.0 + 0.3
-0.2x + x2 = 0.0 + 0.3

Combine like terms: 0.0 + 0.3 = 0.3
-0.2x + x2 = 0.3

The x term is -0.2x.  Take half its coefficient (-0.1).
Square it (0.01) and add it to both sides.

Add '0.01' to each side of the equation.
-0.2x + 0.01 + x2 = 0.3 + 0.01

Reorder the terms:
0.01 + -0.2x + x2 = 0.3 + 0.01

Combine like terms: 0.3 + 0.01 = 0.31
0.01 + -0.2x + x2 = 0.31

Factor a perfect square on the left side:
(x + -0.1)(x + -0.1) = 0.31

Calculate the square root of the right side: 0.556776436

Break this problem into two subproblems by setting 
(x + -0.1) equal to 0.556776436 and -0.556776436.

Subproblem 1

x + -0.1 = 0.556776436 Simplifying x + -0.1 = 0.556776436 Reorder the terms: -0.1 + x = 0.556776436 Solving -0.1 + x = 0.556776436 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1' to each side of the equation. -0.1 + 0.1 + x = 0.556776436 + 0.1 Combine like terms: -0.1 + 0.1 = 0.0 0.0 + x = 0.556776436 + 0.1 x = 0.556776436 + 0.1 Combine like terms: 0.556776436 + 0.1 = 0.656776436 x = 0.656776436 Simplifying x = 0.656776436

Subproblem 2

x + -0.1 = -0.556776436 Simplifying x + -0.1 = -0.556776436 Reorder the terms: -0.1 + x = -0.556776436 Solving -0.1 + x = -0.556776436 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1' to each side of the equation. -0.1 + 0.1 + x = -0.556776436 + 0.1 Combine like terms: -0.1 + 0.1 = 0.0 0.0 + x = -0.556776436 + 0.1 x = -0.556776436 + 0.1 Combine like terms: -0.556776436 + 0.1 = -0.456776436 x = -0.456776436 Simplifying x = -0.456776436

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.656776436, -0.456776436}

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