20x^2+x-3=0

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Solution for 20x^2+x-3=0 equation:


Simplifying
20x2 + x + -3 = 0

Reorder the terms:
-3 + x + 20x2 = 0

Solving
-3 + x + 20x2 = 0

Solving for variable 'x'.

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

Divide each side by '20'.
-0.15 + 0.05x + x2 = 0

Move the constant term to the right:

Add '0.15' to each side of the equation.
-0.15 + 0.05x + 0.15 + x2 = 0 + 0.15

Reorder the terms:
-0.15 + 0.15 + 0.05x + x2 = 0 + 0.15

Combine like terms: -0.15 + 0.15 = 0.00
0.00 + 0.05x + x2 = 0 + 0.15
0.05x + x2 = 0 + 0.15

Combine like terms: 0 + 0.15 = 0.15
0.05x + x2 = 0.15

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
0.05x + 0.25 + x2 = 0.15 + 0.25

Reorder the terms:
0.25 + 0.05x + x2 = 0.15 + 0.25

Combine like terms: 0.15 + 0.25 = 0.4
0.25 + 0.05x + x2 = 0.4

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 0.4

Calculate the square root of the right side: 0.632455532

Break this problem into two subproblems by setting 
(x + 0.5) equal to 0.632455532 and -0.632455532.

Subproblem 1

x + 0.5 = 0.632455532 Simplifying x + 0.5 = 0.632455532 Reorder the terms: 0.5 + x = 0.632455532 Solving 0.5 + x = 0.632455532 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 0.632455532 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 0.632455532 + -0.5 x = 0.632455532 + -0.5 Combine like terms: 0.632455532 + -0.5 = 0.132455532 x = 0.132455532 Simplifying x = 0.132455532

Subproblem 2

x + 0.5 = -0.632455532 Simplifying x + 0.5 = -0.632455532 Reorder the terms: 0.5 + x = -0.632455532 Solving 0.5 + x = -0.632455532 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -0.632455532 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -0.632455532 + -0.5 x = -0.632455532 + -0.5 Combine like terms: -0.632455532 + -0.5 = -1.132455532 x = -1.132455532 Simplifying x = -1.132455532

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.132455532, -1.132455532}

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