4x^2+19x-20=0

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Solution for 4x^2+19x-20=0 equation:


Simplifying
4x2 + 19x + -20 = 0

Reorder the terms:
-20 + 19x + 4x2 = 0

Solving
-20 + 19x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
-5 + 4.75x + x2 = 0

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + 4.75x + 5 + x2 = 0 + 5

Reorder the terms:
-5 + 5 + 4.75x + x2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + 4.75x + x2 = 0 + 5
4.75x + x2 = 0 + 5

Combine like terms: 0 + 5 = 5
4.75x + x2 = 5

The x term is 4.75x.  Take half its coefficient (2.375).
Square it (5.640625) and add it to both sides.

Add '5.640625' to each side of the equation.
4.75x + 5.640625 + x2 = 5 + 5.640625

Reorder the terms:
5.640625 + 4.75x + x2 = 5 + 5.640625

Combine like terms: 5 + 5.640625 = 10.640625
5.640625 + 4.75x + x2 = 10.640625

Factor a perfect square on the left side:
(x + 2.375)(x + 2.375) = 10.640625

Calculate the square root of the right side: 3.261997088

Break this problem into two subproblems by setting 
(x + 2.375) equal to 3.261997088 and -3.261997088.

Subproblem 1

x + 2.375 = 3.261997088 Simplifying x + 2.375 = 3.261997088 Reorder the terms: 2.375 + x = 3.261997088 Solving 2.375 + x = 3.261997088 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.375' to each side of the equation. 2.375 + -2.375 + x = 3.261997088 + -2.375 Combine like terms: 2.375 + -2.375 = 0.000 0.000 + x = 3.261997088 + -2.375 x = 3.261997088 + -2.375 Combine like terms: 3.261997088 + -2.375 = 0.886997088 x = 0.886997088 Simplifying x = 0.886997088

Subproblem 2

x + 2.375 = -3.261997088 Simplifying x + 2.375 = -3.261997088 Reorder the terms: 2.375 + x = -3.261997088 Solving 2.375 + x = -3.261997088 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.375' to each side of the equation. 2.375 + -2.375 + x = -3.261997088 + -2.375 Combine like terms: 2.375 + -2.375 = 0.000 0.000 + x = -3.261997088 + -2.375 x = -3.261997088 + -2.375 Combine like terms: -3.261997088 + -2.375 = -5.636997088 x = -5.636997088 Simplifying x = -5.636997088

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.886997088, -5.636997088}

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