3=.6x^2-x-7

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Solution for 3=.6x^2-x-7 equation:


Simplifying
3 = 0.6x2 + -1x + -7

Reorder the terms:
3 = -7 + -1x + 0.6x2

Solving
3 = -7 + -1x + 0.6x2

Solving for variable 'x'.

Combine like terms: 3 + 7 = 10
10 + x + -0.6x2 = -7 + -1x + 0.6x2 + 7 + x + -0.6x2

Reorder the terms:
10 + x + -0.6x2 = -7 + 7 + -1x + x + 0.6x2 + -0.6x2

Combine like terms: -7 + 7 = 0
10 + x + -0.6x2 = 0 + -1x + x + 0.6x2 + -0.6x2
10 + x + -0.6x2 = -1x + x + 0.6x2 + -0.6x2

Combine like terms: -1x + x = 0
10 + x + -0.6x2 = 0 + 0.6x2 + -0.6x2
10 + x + -0.6x2 = 0.6x2 + -0.6x2

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

Begin completing the square.  Divide all terms by
-0.6 the coefficient of the squared term: 

Divide each side by '-0.6'.
-16.66666667 + -1.666666667x + x2 = 0

Move the constant term to the right:

Add '16.66666667' to each side of the equation.
-16.66666667 + -1.666666667x + 16.66666667 + x2 = 0 + 16.66666667

Reorder the terms:
-16.66666667 + 16.66666667 + -1.666666667x + x2 = 0 + 16.66666667

Combine like terms: -16.66666667 + 16.66666667 = 0.00000000
0.00000000 + -1.666666667x + x2 = 0 + 16.66666667
-1.666666667x + x2 = 0 + 16.66666667

Combine like terms: 0 + 16.66666667 = 16.66666667
-1.666666667x + x2 = 16.66666667

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1.666666667x + 0.25 + x2 = 16.66666667 + 0.25

Reorder the terms:
0.25 + -1.666666667x + x2 = 16.66666667 + 0.25

Combine like terms: 16.66666667 + 0.25 = 16.91666667
0.25 + -1.666666667x + x2 = 16.91666667

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 16.91666667

Calculate the square root of the right side: 4.11298756

Break this problem into two subproblems by setting 
(x + 0.5) equal to 4.11298756 and -4.11298756.

Subproblem 1

x + 0.5 = 4.11298756 Simplifying x + 0.5 = 4.11298756 Reorder the terms: 0.5 + x = 4.11298756 Solving 0.5 + x = 4.11298756 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 4.11298756 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 4.11298756 + -0.5 x = 4.11298756 + -0.5 Combine like terms: 4.11298756 + -0.5 = 3.61298756 x = 3.61298756 Simplifying x = 3.61298756

Subproblem 2

x + 0.5 = -4.11298756 Simplifying x + 0.5 = -4.11298756 Reorder the terms: 0.5 + x = -4.11298756 Solving 0.5 + x = -4.11298756 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -4.11298756 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -4.11298756 + -0.5 x = -4.11298756 + -0.5 Combine like terms: -4.11298756 + -0.5 = -4.61298756 x = -4.61298756 Simplifying x = -4.61298756

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.61298756, -4.61298756}

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