0.6679=-.0074x^2+0.2505x

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Solution for 0.6679=-.0074x^2+0.2505x equation:


Simplifying
0.6679 = -0.0074x2 + 0.2505x

Reorder the terms:
0.6679 = 0.2505x + -0.0074x2

Solving
0.6679 = 0.2505x + -0.0074x2

Solving for variable 'x'.

Reorder the terms:
0.6679 + -0.2505x + 0.0074x2 = 0.2505x + -0.2505x + -0.0074x2 + 0.0074x2

Combine like terms: 0.2505x + -0.2505x = 0.0000
0.6679 + -0.2505x + 0.0074x2 = 0.0000 + -0.0074x2 + 0.0074x2
0.6679 + -0.2505x + 0.0074x2 = -0.0074x2 + 0.0074x2

Combine like terms: -0.0074x2 + 0.0074x2 = 0.0000
0.6679 + -0.2505x + 0.0074x2 = 0.0000

Begin completing the square.  Divide all terms by
0.0074 the coefficient of the squared term: 

Divide each side by '0.0074'.
90.25675676 + -33.85135135x + x2 = 0

Move the constant term to the right:

Add '-90.25675676' to each side of the equation.
90.25675676 + -33.85135135x + -90.25675676 + x2 = 0 + -90.25675676

Reorder the terms:
90.25675676 + -90.25675676 + -33.85135135x + x2 = 0 + -90.25675676

Combine like terms: 90.25675676 + -90.25675676 = 0.00000000
0.00000000 + -33.85135135x + x2 = 0 + -90.25675676
-33.85135135x + x2 = 0 + -90.25675676

Combine like terms: 0 + -90.25675676 = -90.25675676
-33.85135135x + x2 = -90.25675676

The x term is -33.85135135x.  Take half its coefficient (-16.92567568).
Square it (286.4784972) and add it to both sides.

Add '286.4784972' to each side of the equation.
-33.85135135x + 286.4784972 + x2 = -90.25675676 + 286.4784972

Reorder the terms:
286.4784972 + -33.85135135x + x2 = -90.25675676 + 286.4784972

Combine like terms: -90.25675676 + 286.4784972 = 196.22174044
286.4784972 + -33.85135135x + x2 = 196.22174044

Factor a perfect square on the left side:
(x + -16.92567568)(x + -16.92567568) = 196.22174044

Calculate the square root of the right side: 14.007917063

Break this problem into two subproblems by setting 
(x + -16.92567568) equal to 14.007917063 and -14.007917063.

Subproblem 1

x + -16.92567568 = 14.007917063 Simplifying x + -16.92567568 = 14.007917063 Reorder the terms: -16.92567568 + x = 14.007917063 Solving -16.92567568 + x = 14.007917063 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '16.92567568' to each side of the equation. -16.92567568 + 16.92567568 + x = 14.007917063 + 16.92567568 Combine like terms: -16.92567568 + 16.92567568 = 0.00000000 0.00000000 + x = 14.007917063 + 16.92567568 x = 14.007917063 + 16.92567568 Combine like terms: 14.007917063 + 16.92567568 = 30.933592743 x = 30.933592743 Simplifying x = 30.933592743

Subproblem 2

x + -16.92567568 = -14.007917063 Simplifying x + -16.92567568 = -14.007917063 Reorder the terms: -16.92567568 + x = -14.007917063 Solving -16.92567568 + x = -14.007917063 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '16.92567568' to each side of the equation. -16.92567568 + 16.92567568 + x = -14.007917063 + 16.92567568 Combine like terms: -16.92567568 + 16.92567568 = 0.00000000 0.00000000 + x = -14.007917063 + 16.92567568 x = -14.007917063 + 16.92567568 Combine like terms: -14.007917063 + 16.92567568 = 2.917758617 x = 2.917758617 Simplifying x = 2.917758617

Solution

The solution to the problem is based on the solutions from the subproblems. x = {30.933592743, 2.917758617}

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