(3x^2-7x-4)-(6x^2-8)=

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Solution for (3x^2-7x-4)-(6x^2-8)= equation:


Simplifying
(3x2 + -7x + -4) + -1(6x2 + -8) = 0

Reorder the terms:
(-4 + -7x + 3x2) + -1(6x2 + -8) = 0

Remove parenthesis around (-4 + -7x + 3x2)
-4 + -7x + 3x2 + -1(6x2 + -8) = 0

Reorder the terms:
-4 + -7x + 3x2 + -1(-8 + 6x2) = 0
-4 + -7x + 3x2 + (-8 * -1 + 6x2 * -1) = 0
-4 + -7x + 3x2 + (8 + -6x2) = 0

Reorder the terms:
-4 + 8 + -7x + 3x2 + -6x2 = 0

Combine like terms: -4 + 8 = 4
4 + -7x + 3x2 + -6x2 = 0

Combine like terms: 3x2 + -6x2 = -3x2
4 + -7x + -3x2 = 0

Solving
4 + -7x + -3x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-3 the coefficient of the squared term: 

Divide each side by '-3'.
-1.333333333 + 2.333333333x + x2 = 0

Move the constant term to the right:

Add '1.333333333' to each side of the equation.
-1.333333333 + 2.333333333x + 1.333333333 + x2 = 0 + 1.333333333

Reorder the terms:
-1.333333333 + 1.333333333 + 2.333333333x + x2 = 0 + 1.333333333

Combine like terms: -1.333333333 + 1.333333333 = 0.000000000
0.000000000 + 2.333333333x + x2 = 0 + 1.333333333
2.333333333x + x2 = 0 + 1.333333333

Combine like terms: 0 + 1.333333333 = 1.333333333
2.333333333x + x2 = 1.333333333

The x term is 2.333333333x.  Take half its coefficient (1.166666667).
Square it (1.361111112) and add it to both sides.

Add '1.361111112' to each side of the equation.
2.333333333x + 1.361111112 + x2 = 1.333333333 + 1.361111112

Reorder the terms:
1.361111112 + 2.333333333x + x2 = 1.333333333 + 1.361111112

Combine like terms: 1.333333333 + 1.361111112 = 2.694444445
1.361111112 + 2.333333333x + x2 = 2.694444445

Factor a perfect square on the left side:
(x + 1.166666667)(x + 1.166666667) = 2.694444445

Calculate the square root of the right side: 1.6414763

Break this problem into two subproblems by setting 
(x + 1.166666667) equal to 1.6414763 and -1.6414763.

Subproblem 1

x + 1.166666667 = 1.6414763 Simplifying x + 1.166666667 = 1.6414763 Reorder the terms: 1.166666667 + x = 1.6414763 Solving 1.166666667 + x = 1.6414763 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.166666667' to each side of the equation. 1.166666667 + -1.166666667 + x = 1.6414763 + -1.166666667 Combine like terms: 1.166666667 + -1.166666667 = 0.000000000 0.000000000 + x = 1.6414763 + -1.166666667 x = 1.6414763 + -1.166666667 Combine like terms: 1.6414763 + -1.166666667 = 0.474809633 x = 0.474809633 Simplifying x = 0.474809633

Subproblem 2

x + 1.166666667 = -1.6414763 Simplifying x + 1.166666667 = -1.6414763 Reorder the terms: 1.166666667 + x = -1.6414763 Solving 1.166666667 + x = -1.6414763 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.166666667' to each side of the equation. 1.166666667 + -1.166666667 + x = -1.6414763 + -1.166666667 Combine like terms: 1.166666667 + -1.166666667 = 0.000000000 0.000000000 + x = -1.6414763 + -1.166666667 x = -1.6414763 + -1.166666667 Combine like terms: -1.6414763 + -1.166666667 = -2.808142967 x = -2.808142967 Simplifying x = -2.808142967

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.474809633, -2.808142967}

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