40=0.10x^2+1.28x-0.01

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Solution for 40=0.10x^2+1.28x-0.01 equation:


Simplifying
40 = 0.10x2 + 1.28x + -0.01

Reorder the terms:
40 = -0.01 + 1.28x + 0.10x2

Solving
40 = -0.01 + 1.28x + 0.10x2

Solving for variable 'x'.

Combine like terms: 40 + 0.01 = 40.01
40.01 + -1.28x + -0.10x2 = -0.01 + 1.28x + 0.10x2 + 0.01 + -1.28x + -0.10x2

Reorder the terms:
40.01 + -1.28x + -0.10x2 = -0.01 + 0.01 + 1.28x + -1.28x + 0.10x2 + -0.10x2

Combine like terms: -0.01 + 0.01 = 0.00
40.01 + -1.28x + -0.10x2 = 0.00 + 1.28x + -1.28x + 0.10x2 + -0.10x2
40.01 + -1.28x + -0.10x2 = 1.28x + -1.28x + 0.10x2 + -0.10x2

Combine like terms: 1.28x + -1.28x = 0.00
40.01 + -1.28x + -0.10x2 = 0.00 + 0.10x2 + -0.10x2
40.01 + -1.28x + -0.10x2 = 0.10x2 + -0.10x2

Combine like terms: 0.10x2 + -0.10x2 = 0.00
40.01 + -1.28x + -0.10x2 = 0.00

Begin completing the square.  Divide all terms by
-0.10 the coefficient of the squared term: 

Divide each side by '-0.10'.
-400.1 + 12.8x + x2 = 0

Move the constant term to the right:

Add '400.1' to each side of the equation.
-400.1 + 12.8x + 400.1 + x2 = 0 + 400.1

Reorder the terms:
-400.1 + 400.1 + 12.8x + x2 = 0 + 400.1

Combine like terms: -400.1 + 400.1 = 0.0
0.0 + 12.8x + x2 = 0 + 400.1
12.8x + x2 = 0 + 400.1

Combine like terms: 0 + 400.1 = 400.1
12.8x + x2 = 400.1

The x term is 12.8x.  Take half its coefficient (6.4).
Square it (40.96) and add it to both sides.

Add '40.96' to each side of the equation.
12.8x + 40.96 + x2 = 400.1 + 40.96

Reorder the terms:
40.96 + 12.8x + x2 = 400.1 + 40.96

Combine like terms: 400.1 + 40.96 = 441.06
40.96 + 12.8x + x2 = 441.06

Factor a perfect square on the left side:
(x + 6.4)(x + 6.4) = 441.06

Calculate the square root of the right side: 21.001428523

Break this problem into two subproblems by setting 
(x + 6.4) equal to 21.001428523 and -21.001428523.

Subproblem 1

x + 6.4 = 21.001428523 Simplifying x + 6.4 = 21.001428523 Reorder the terms: 6.4 + x = 21.001428523 Solving 6.4 + x = 21.001428523 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6.4' to each side of the equation. 6.4 + -6.4 + x = 21.001428523 + -6.4 Combine like terms: 6.4 + -6.4 = 0.0 0.0 + x = 21.001428523 + -6.4 x = 21.001428523 + -6.4 Combine like terms: 21.001428523 + -6.4 = 14.601428523 x = 14.601428523 Simplifying x = 14.601428523

Subproblem 2

x + 6.4 = -21.001428523 Simplifying x + 6.4 = -21.001428523 Reorder the terms: 6.4 + x = -21.001428523 Solving 6.4 + x = -21.001428523 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6.4' to each side of the equation. 6.4 + -6.4 + x = -21.001428523 + -6.4 Combine like terms: 6.4 + -6.4 = 0.0 0.0 + x = -21.001428523 + -6.4 x = -21.001428523 + -6.4 Combine like terms: -21.001428523 + -6.4 = -27.401428523 x = -27.401428523 Simplifying x = -27.401428523

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14.601428523, -27.401428523}

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