(-3x^2+5)-(5x^2+2x-6)=

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Solution for (-3x^2+5)-(5x^2+2x-6)= equation:


Simplifying
(-3x2 + 5) + -1(5x2 + 2x + -6) = 0

Reorder the terms:
(5 + -3x2) + -1(5x2 + 2x + -6) = 0

Remove parenthesis around (5 + -3x2)
5 + -3x2 + -1(5x2 + 2x + -6) = 0

Reorder the terms:
5 + -3x2 + -1(-6 + 2x + 5x2) = 0
5 + -3x2 + (-6 * -1 + 2x * -1 + 5x2 * -1) = 0
5 + -3x2 + (6 + -2x + -5x2) = 0

Reorder the terms:
5 + 6 + -2x + -3x2 + -5x2 = 0

Combine like terms: 5 + 6 = 11
11 + -2x + -3x2 + -5x2 = 0

Combine like terms: -3x2 + -5x2 = -8x2
11 + -2x + -8x2 = 0

Solving
11 + -2x + -8x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-8 the coefficient of the squared term: 

Divide each side by '-8'.
-1.375 + 0.25x + x2 = 0

Move the constant term to the right:

Add '1.375' to each side of the equation.
-1.375 + 0.25x + 1.375 + x2 = 0 + 1.375

Reorder the terms:
-1.375 + 1.375 + 0.25x + x2 = 0 + 1.375

Combine like terms: -1.375 + 1.375 = 0.000
0.000 + 0.25x + x2 = 0 + 1.375
0.25x + x2 = 0 + 1.375

Combine like terms: 0 + 1.375 = 1.375
0.25x + x2 = 1.375

The x term is 0.25x.  Take half its coefficient (0.125).
Square it (0.015625) and add it to both sides.

Add '0.015625' to each side of the equation.
0.25x + 0.015625 + x2 = 1.375 + 0.015625

Reorder the terms:
0.015625 + 0.25x + x2 = 1.375 + 0.015625

Combine like terms: 1.375 + 0.015625 = 1.390625
0.015625 + 0.25x + x2 = 1.390625

Factor a perfect square on the left side:
(x + 0.125)(x + 0.125) = 1.390625

Calculate the square root of the right side: 1.179247642

Break this problem into two subproblems by setting 
(x + 0.125) equal to 1.179247642 and -1.179247642.

Subproblem 1

x + 0.125 = 1.179247642 Simplifying x + 0.125 = 1.179247642 Reorder the terms: 0.125 + x = 1.179247642 Solving 0.125 + x = 1.179247642 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.125' to each side of the equation. 0.125 + -0.125 + x = 1.179247642 + -0.125 Combine like terms: 0.125 + -0.125 = 0.000 0.000 + x = 1.179247642 + -0.125 x = 1.179247642 + -0.125 Combine like terms: 1.179247642 + -0.125 = 1.054247642 x = 1.054247642 Simplifying x = 1.054247642

Subproblem 2

x + 0.125 = -1.179247642 Simplifying x + 0.125 = -1.179247642 Reorder the terms: 0.125 + x = -1.179247642 Solving 0.125 + x = -1.179247642 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.125' to each side of the equation. 0.125 + -0.125 + x = -1.179247642 + -0.125 Combine like terms: 0.125 + -0.125 = 0.000 0.000 + x = -1.179247642 + -0.125 x = -1.179247642 + -0.125 Combine like terms: -1.179247642 + -0.125 = -1.304247642 x = -1.304247642 Simplifying x = -1.304247642

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.054247642, -1.304247642}

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