-0.04x^2+0.64x+1.94=0

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Solution for -0.04x^2+0.64x+1.94=0 equation:


Simplifying
-0.04x2 + 0.64x + 1.94 = 0

Reorder the terms:
1.94 + 0.64x + -0.04x2 = 0

Solving
1.94 + 0.64x + -0.04x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-0.04 the coefficient of the squared term: 

Divide each side by '-0.04'.
-48.5 + -16x + x2 = 0

Move the constant term to the right:

Add '48.5' to each side of the equation.
-48.5 + -16x + 48.5 + x2 = 0 + 48.5

Reorder the terms:
-48.5 + 48.5 + -16x + x2 = 0 + 48.5

Combine like terms: -48.5 + 48.5 = 0.0
0.0 + -16x + x2 = 0 + 48.5
-16x + x2 = 0 + 48.5

Combine like terms: 0 + 48.5 = 48.5
-16x + x2 = 48.5

The x term is -16x.  Take half its coefficient (-8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
-16x + 64 + x2 = 48.5 + 64

Reorder the terms:
64 + -16x + x2 = 48.5 + 64

Combine like terms: 48.5 + 64 = 112.5
64 + -16x + x2 = 112.5

Factor a perfect square on the left side:
(x + -8)(x + -8) = 112.5

Calculate the square root of the right side: 10.606601718

Break this problem into two subproblems by setting 
(x + -8) equal to 10.606601718 and -10.606601718.

Subproblem 1

x + -8 = 10.606601718 Simplifying x + -8 = 10.606601718 Reorder the terms: -8 + x = 10.606601718 Solving -8 + x = 10.606601718 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + x = 10.606601718 + 8 Combine like terms: -8 + 8 = 0 0 + x = 10.606601718 + 8 x = 10.606601718 + 8 Combine like terms: 10.606601718 + 8 = 18.606601718 x = 18.606601718 Simplifying x = 18.606601718

Subproblem 2

x + -8 = -10.606601718 Simplifying x + -8 = -10.606601718 Reorder the terms: -8 + x = -10.606601718 Solving -8 + x = -10.606601718 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + x = -10.606601718 + 8 Combine like terms: -8 + 8 = 0 0 + x = -10.606601718 + 8 x = -10.606601718 + 8 Combine like terms: -10.606601718 + 8 = -2.606601718 x = -2.606601718 Simplifying x = -2.606601718

Solution

The solution to the problem is based on the solutions from the subproblems. x = {18.606601718, -2.606601718}

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