(3x^2+2x-8)-(2x^2-4x+7)=

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Solution for (3x^2+2x-8)-(2x^2-4x+7)= equation:


Simplifying
(3x2 + 2x + -8) + -1(2x2 + -4x + 7) = 0

Reorder the terms:
(-8 + 2x + 3x2) + -1(2x2 + -4x + 7) = 0

Remove parenthesis around (-8 + 2x + 3x2)
-8 + 2x + 3x2 + -1(2x2 + -4x + 7) = 0

Reorder the terms:
-8 + 2x + 3x2 + -1(7 + -4x + 2x2) = 0
-8 + 2x + 3x2 + (7 * -1 + -4x * -1 + 2x2 * -1) = 0
-8 + 2x + 3x2 + (-7 + 4x + -2x2) = 0

Reorder the terms:
-8 + -7 + 2x + 4x + 3x2 + -2x2 = 0

Combine like terms: -8 + -7 = -15
-15 + 2x + 4x + 3x2 + -2x2 = 0

Combine like terms: 2x + 4x = 6x
-15 + 6x + 3x2 + -2x2 = 0

Combine like terms: 3x2 + -2x2 = 1x2
-15 + 6x + 1x2 = 0

Solving
-15 + 6x + 1x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '15' to each side of the equation.
-15 + 6x + 15 + x2 = 0 + 15

Reorder the terms:
-15 + 15 + 6x + x2 = 0 + 15

Combine like terms: -15 + 15 = 0
0 + 6x + x2 = 0 + 15
6x + x2 = 0 + 15

Combine like terms: 0 + 15 = 15
6x + x2 = 15

The x term is 6x.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6x + 9 + x2 = 15 + 9

Reorder the terms:
9 + 6x + x2 = 15 + 9

Combine like terms: 15 + 9 = 24
9 + 6x + x2 = 24

Factor a perfect square on the left side:
(x + 3)(x + 3) = 24

Calculate the square root of the right side: 4.898979486

Break this problem into two subproblems by setting 
(x + 3) equal to 4.898979486 and -4.898979486.

Subproblem 1

x + 3 = 4.898979486 Simplifying x + 3 = 4.898979486 Reorder the terms: 3 + x = 4.898979486 Solving 3 + x = 4.898979486 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 4.898979486 + -3 Combine like terms: 3 + -3 = 0 0 + x = 4.898979486 + -3 x = 4.898979486 + -3 Combine like terms: 4.898979486 + -3 = 1.898979486 x = 1.898979486 Simplifying x = 1.898979486

Subproblem 2

x + 3 = -4.898979486 Simplifying x + 3 = -4.898979486 Reorder the terms: 3 + x = -4.898979486 Solving 3 + x = -4.898979486 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = -4.898979486 + -3 Combine like terms: 3 + -3 = 0 0 + x = -4.898979486 + -3 x = -4.898979486 + -3 Combine like terms: -4.898979486 + -3 = -7.898979486 x = -7.898979486 Simplifying x = -7.898979486

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.898979486, -7.898979486}

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