3=-.6x^2+x+4

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Solution for 3=-.6x^2+x+4 equation:


Simplifying
3 = -0.6x2 + x + 4

Reorder the terms:
3 = 4 + x + -0.6x2

Solving
3 = 4 + x + -0.6x2

Solving for variable 'x'.

Combine like terms: 3 + -4 = -1
-1 + -1x + 0.6x2 = 4 + x + -0.6x2 + -4 + -1x + 0.6x2

Reorder the terms:
-1 + -1x + 0.6x2 = 4 + -4 + x + -1x + -0.6x2 + 0.6x2

Combine like terms: 4 + -4 = 0
-1 + -1x + 0.6x2 = 0 + x + -1x + -0.6x2 + 0.6x2
-1 + -1x + 0.6x2 = x + -1x + -0.6x2 + 0.6x2

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

Combine like terms: -0.6x2 + 0.6x2 = 0.0
-1 + -1x + 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'.
-1.666666667 + -1.666666667x + x2 = 0

Move the constant term to the right:

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

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

Combine like terms: -1.666666667 + 1.666666667 = 0.000000000
0.000000000 + -1.666666667x + x2 = 0 + 1.666666667
-1.666666667x + x2 = 0 + 1.666666667

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

The x term is -1.666666667x.  Take half its coefficient (-0.8333333335).
Square it (0.6944444447) and add it to both sides.

Add '0.6944444447' to each side of the equation.
-1.666666667x + 0.6944444447 + x2 = 1.666666667 + 0.6944444447

Reorder the terms:
0.6944444447 + -1.666666667x + x2 = 1.666666667 + 0.6944444447

Combine like terms: 1.666666667 + 0.6944444447 = 2.3611111117
0.6944444447 + -1.666666667x + x2 = 2.3611111117

Factor a perfect square on the left side:
(x + -0.8333333335)(x + -0.8333333335) = 2.3611111117

Calculate the square root of the right side: 1.536590743

Break this problem into two subproblems by setting 
(x + -0.8333333335) equal to 1.536590743 and -1.536590743.

Subproblem 1

x + -0.8333333335 = 1.536590743 Simplifying x + -0.8333333335 = 1.536590743 Reorder the terms: -0.8333333335 + x = 1.536590743 Solving -0.8333333335 + x = 1.536590743 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8333333335' to each side of the equation. -0.8333333335 + 0.8333333335 + x = 1.536590743 + 0.8333333335 Combine like terms: -0.8333333335 + 0.8333333335 = 0.0000000000 0.0000000000 + x = 1.536590743 + 0.8333333335 x = 1.536590743 + 0.8333333335 Combine like terms: 1.536590743 + 0.8333333335 = 2.3699240765 x = 2.3699240765 Simplifying x = 2.3699240765

Subproblem 2

x + -0.8333333335 = -1.536590743 Simplifying x + -0.8333333335 = -1.536590743 Reorder the terms: -0.8333333335 + x = -1.536590743 Solving -0.8333333335 + x = -1.536590743 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8333333335' to each side of the equation. -0.8333333335 + 0.8333333335 + x = -1.536590743 + 0.8333333335 Combine like terms: -0.8333333335 + 0.8333333335 = 0.0000000000 0.0000000000 + x = -1.536590743 + 0.8333333335 x = -1.536590743 + 0.8333333335 Combine like terms: -1.536590743 + 0.8333333335 = -0.7032574095 x = -0.7032574095 Simplifying x = -0.7032574095

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.3699240765, -0.7032574095}

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