5x^2+5x-20=4

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Solution for 5x^2+5x-20=4 equation:


Simplifying
5x2 + 5x + -20 = 4

Reorder the terms:
-20 + 5x + 5x2 = 4

Solving
-20 + 5x + 5x2 = 4

Solving for variable 'x'.

Reorder the terms:
-20 + -4 + 5x + 5x2 = 4 + -4

Combine like terms: -20 + -4 = -24
-24 + 5x + 5x2 = 4 + -4

Combine like terms: 4 + -4 = 0
-24 + 5x + 5x2 = 0

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

Divide each side by '5'.
-4.8 + x + x2 = 0

Move the constant term to the right:

Add '4.8' to each side of the equation.
-4.8 + x + 4.8 + x2 = 0 + 4.8

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

Combine like terms: -4.8 + 4.8 = 0.0
0.0 + x + x2 = 0 + 4.8
x + x2 = 0 + 4.8

Combine like terms: 0 + 4.8 = 4.8
x + x2 = 4.8

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.
 + 0.25 + x2 = 4.8 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 4.8 + 0.25

Combine like terms: 4.8 + 0.25 = 5.05
1.25 + x2 = 5.05

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 5.05

Calculate the square root of the right side: 2.247220505

Break this problem into two subproblems by setting 
(x + 0.5) equal to 2.247220505 and -2.247220505.

Subproblem 1

x + 0.5 = 2.247220505 Simplifying x + 0.5 = 2.247220505 Reorder the terms: 0.5 + x = 2.247220505 Solving 0.5 + x = 2.247220505 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 = 2.247220505 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 2.247220505 + -0.5 x = 2.247220505 + -0.5 Combine like terms: 2.247220505 + -0.5 = 1.747220505 x = 1.747220505 Simplifying x = 1.747220505

Subproblem 2

x + 0.5 = -2.247220505 Simplifying x + 0.5 = -2.247220505 Reorder the terms: 0.5 + x = -2.247220505 Solving 0.5 + x = -2.247220505 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 = -2.247220505 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -2.247220505 + -0.5 x = -2.247220505 + -0.5 Combine like terms: -2.247220505 + -0.5 = -2.747220505 x = -2.747220505 Simplifying x = -2.747220505

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.747220505, -2.747220505}

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