100*x^2+4x-4.8=0

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Solution for 100*x^2+4x-4.8=0 equation:


Simplifying
100x2 + 4x + -4.8 = 0

Reorder the terms:
-4.8 + 4x + 100x2 = 0

Solving
-4.8 + 4x + 100x2 = 0

Solving for variable 'x'.

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

Divide each side by '100'.
-0.048 + 0.04x + x2 = 0

Move the constant term to the right:

Add '0.048' to each side of the equation.
-0.048 + 0.04x + 0.048 + x2 = 0 + 0.048

Reorder the terms:
-0.048 + 0.048 + 0.04x + x2 = 0 + 0.048

Combine like terms: -0.048 + 0.048 = 0.000
0.000 + 0.04x + x2 = 0 + 0.048
0.04x + x2 = 0 + 0.048

Combine like terms: 0 + 0.048 = 0.048
0.04x + x2 = 0.048

The x term is 0.04x.  Take half its coefficient (0.02).
Square it (0.0004) and add it to both sides.

Add '0.0004' to each side of the equation.
0.04x + 0.0004 + x2 = 0.048 + 0.0004

Reorder the terms:
0.0004 + 0.04x + x2 = 0.048 + 0.0004

Combine like terms: 0.048 + 0.0004 = 0.0484
0.0004 + 0.04x + x2 = 0.0484

Factor a perfect square on the left side:
(x + 0.02)(x + 0.02) = 0.0484

Calculate the square root of the right side: 0.22

Break this problem into two subproblems by setting 
(x + 0.02) equal to 0.22 and -0.22.

Subproblem 1

x + 0.02 = 0.22 Simplifying x + 0.02 = 0.22 Reorder the terms: 0.02 + x = 0.22 Solving 0.02 + x = 0.22 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.02' to each side of the equation. 0.02 + -0.02 + x = 0.22 + -0.02 Combine like terms: 0.02 + -0.02 = 0.00 0.00 + x = 0.22 + -0.02 x = 0.22 + -0.02 Combine like terms: 0.22 + -0.02 = 0.2 x = 0.2 Simplifying x = 0.2

Subproblem 2

x + 0.02 = -0.22 Simplifying x + 0.02 = -0.22 Reorder the terms: 0.02 + x = -0.22 Solving 0.02 + x = -0.22 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.02' to each side of the equation. 0.02 + -0.02 + x = -0.22 + -0.02 Combine like terms: 0.02 + -0.02 = 0.00 0.00 + x = -0.22 + -0.02 x = -0.22 + -0.02 Combine like terms: -0.22 + -0.02 = -0.24 x = -0.24 Simplifying x = -0.24

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.2, -0.24}

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