20x^2+21x-60=0

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Solution for 20x^2+21x-60=0 equation:


Simplifying
20x2 + 21x + -60 = 0

Reorder the terms:
-60 + 21x + 20x2 = 0

Solving
-60 + 21x + 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'.
-3 + 1.05x + x2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + 1.05x + 3 + x2 = 0 + 3

Reorder the terms:
-3 + 3 + 1.05x + x2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + 1.05x + x2 = 0 + 3
1.05x + x2 = 0 + 3

Combine like terms: 0 + 3 = 3
1.05x + x2 = 3

The x term is 1.05x.  Take half its coefficient (0.525).
Square it (0.275625) and add it to both sides.

Add '0.275625' to each side of the equation.
1.05x + 0.275625 + x2 = 3 + 0.275625

Reorder the terms:
0.275625 + 1.05x + x2 = 3 + 0.275625

Combine like terms: 3 + 0.275625 = 3.275625
0.275625 + 1.05x + x2 = 3.275625

Factor a perfect square on the left side:
(x + 0.525)(x + 0.525) = 3.275625

Calculate the square root of the right side: 1.80986878

Break this problem into two subproblems by setting 
(x + 0.525) equal to 1.80986878 and -1.80986878.

Subproblem 1

x + 0.525 = 1.80986878 Simplifying x + 0.525 = 1.80986878 Reorder the terms: 0.525 + x = 1.80986878 Solving 0.525 + x = 1.80986878 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.525' to each side of the equation. 0.525 + -0.525 + x = 1.80986878 + -0.525 Combine like terms: 0.525 + -0.525 = 0.000 0.000 + x = 1.80986878 + -0.525 x = 1.80986878 + -0.525 Combine like terms: 1.80986878 + -0.525 = 1.28486878 x = 1.28486878 Simplifying x = 1.28486878

Subproblem 2

x + 0.525 = -1.80986878 Simplifying x + 0.525 = -1.80986878 Reorder the terms: 0.525 + x = -1.80986878 Solving 0.525 + x = -1.80986878 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.525' to each side of the equation. 0.525 + -0.525 + x = -1.80986878 + -0.525 Combine like terms: 0.525 + -0.525 = 0.000 0.000 + x = -1.80986878 + -0.525 x = -1.80986878 + -0.525 Combine like terms: -1.80986878 + -0.525 = -2.33486878 x = -2.33486878 Simplifying x = -2.33486878

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.28486878, -2.33486878}

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