-0.01x^2+0.6x+6.4=0

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Solution for -0.01x^2+0.6x+6.4=0 equation:


Simplifying
-0.01x2 + 0.6x + 6.4 = 0

Reorder the terms:
6.4 + 0.6x + -0.01x2 = 0

Solving
6.4 + 0.6x + -0.01x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-0.01 the coefficient of the squared term: 

Divide each side by '-0.01'.
-640 + -60x + x2 = 0

Move the constant term to the right:

Add '640' to each side of the equation.
-640 + -60x + 640 + x2 = 0 + 640

Reorder the terms:
-640 + 640 + -60x + x2 = 0 + 640

Combine like terms: -640 + 640 = 0
0 + -60x + x2 = 0 + 640
-60x + x2 = 0 + 640

Combine like terms: 0 + 640 = 640
-60x + x2 = 640

The x term is -60x.  Take half its coefficient (-30).
Square it (900) and add it to both sides.

Add '900' to each side of the equation.
-60x + 900 + x2 = 640 + 900

Reorder the terms:
900 + -60x + x2 = 640 + 900

Combine like terms: 640 + 900 = 1540
900 + -60x + x2 = 1540

Factor a perfect square on the left side:
(x + -30)(x + -30) = 1540

Calculate the square root of the right side: 39.242833741

Break this problem into two subproblems by setting 
(x + -30) equal to 39.242833741 and -39.242833741.

Subproblem 1

x + -30 = 39.242833741 Simplifying x + -30 = 39.242833741 Reorder the terms: -30 + x = 39.242833741 Solving -30 + x = 39.242833741 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '30' to each side of the equation. -30 + 30 + x = 39.242833741 + 30 Combine like terms: -30 + 30 = 0 0 + x = 39.242833741 + 30 x = 39.242833741 + 30 Combine like terms: 39.242833741 + 30 = 69.242833741 x = 69.242833741 Simplifying x = 69.242833741

Subproblem 2

x + -30 = -39.242833741 Simplifying x + -30 = -39.242833741 Reorder the terms: -30 + x = -39.242833741 Solving -30 + x = -39.242833741 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '30' to each side of the equation. -30 + 30 + x = -39.242833741 + 30 Combine like terms: -30 + 30 = 0 0 + x = -39.242833741 + 30 x = -39.242833741 + 30 Combine like terms: -39.242833741 + 30 = -9.242833741 x = -9.242833741 Simplifying x = -9.242833741

Solution

The solution to the problem is based on the solutions from the subproblems. x = {69.242833741, -9.242833741}

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