9=0.007X^2+0.003X

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Solution for 9=0.007X^2+0.003X equation:


Simplifying
9 = 0.007X2 + 0.003X

Reorder the terms:
9 = 0.003X + 0.007X2

Solving
9 = 0.003X + 0.007X2

Solving for variable 'X'.

Reorder the terms:
9 + -0.003X + -0.007X2 = 0.003X + -0.003X + 0.007X2 + -0.007X2

Combine like terms: 0.003X + -0.003X = 0.000
9 + -0.003X + -0.007X2 = 0.000 + 0.007X2 + -0.007X2
9 + -0.003X + -0.007X2 = 0.007X2 + -0.007X2

Combine like terms: 0.007X2 + -0.007X2 = 0.000
9 + -0.003X + -0.007X2 = 0.000

Begin completing the square.  Divide all terms by
-0.007 the coefficient of the squared term: 

Divide each side by '-0.007'.
-1285.714286 + 0.4285714286X + X2 = 0

Move the constant term to the right:

Add '1285.714286' to each side of the equation.
-1285.714286 + 0.4285714286X + 1285.714286 + X2 = 0 + 1285.714286

Reorder the terms:
-1285.714286 + 1285.714286 + 0.4285714286X + X2 = 0 + 1285.714286

Combine like terms: -1285.714286 + 1285.714286 = 0.000000
0.000000 + 0.4285714286X + X2 = 0 + 1285.714286
0.4285714286X + X2 = 0 + 1285.714286

Combine like terms: 0 + 1285.714286 = 1285.714286
0.4285714286X + X2 = 1285.714286

The X term is 0.4285714286X.  Take half its coefficient (0.2142857143).
Square it (0.04591836735) and add it to both sides.

Add '0.04591836735' to each side of the equation.
0.4285714286X + 0.04591836735 + X2 = 1285.714286 + 0.04591836735

Reorder the terms:
0.04591836735 + 0.4285714286X + X2 = 1285.714286 + 0.04591836735

Combine like terms: 1285.714286 + 0.04591836735 = 1285.76020436735
0.04591836735 + 0.4285714286X + X2 = 1285.76020436735

Factor a perfect square on the left side:
(X + 0.2142857143)(X + 0.2142857143) = 1285.76020436735

Calculate the square root of the right side: 35.857498579

Break this problem into two subproblems by setting 
(X + 0.2142857143) equal to 35.857498579 and -35.857498579.

Subproblem 1

X + 0.2142857143 = 35.857498579 Simplifying X + 0.2142857143 = 35.857498579 Reorder the terms: 0.2142857143 + X = 35.857498579 Solving 0.2142857143 + X = 35.857498579 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-0.2142857143' to each side of the equation. 0.2142857143 + -0.2142857143 + X = 35.857498579 + -0.2142857143 Combine like terms: 0.2142857143 + -0.2142857143 = 0.0000000000 0.0000000000 + X = 35.857498579 + -0.2142857143 X = 35.857498579 + -0.2142857143 Combine like terms: 35.857498579 + -0.2142857143 = 35.6432128647 X = 35.6432128647 Simplifying X = 35.6432128647

Subproblem 2

X + 0.2142857143 = -35.857498579 Simplifying X + 0.2142857143 = -35.857498579 Reorder the terms: 0.2142857143 + X = -35.857498579 Solving 0.2142857143 + X = -35.857498579 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-0.2142857143' to each side of the equation. 0.2142857143 + -0.2142857143 + X = -35.857498579 + -0.2142857143 Combine like terms: 0.2142857143 + -0.2142857143 = 0.0000000000 0.0000000000 + X = -35.857498579 + -0.2142857143 X = -35.857498579 + -0.2142857143 Combine like terms: -35.857498579 + -0.2142857143 = -36.0717842933 X = -36.0717842933 Simplifying X = -36.0717842933

Solution

The solution to the problem is based on the solutions from the subproblems. X = {35.6432128647, -36.0717842933}

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