5x^2+20x-63=0

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Solution for 5x^2+20x-63=0 equation:


Simplifying
5x2 + 20x + -63 = 0

Reorder the terms:
-63 + 20x + 5x2 = 0

Solving
-63 + 20x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-12.6 + 4x + x2 = 0

Move the constant term to the right:

Add '12.6' to each side of the equation.
-12.6 + 4x + 12.6 + x2 = 0 + 12.6

Reorder the terms:
-12.6 + 12.6 + 4x + x2 = 0 + 12.6

Combine like terms: -12.6 + 12.6 = 0.0
0.0 + 4x + x2 = 0 + 12.6
4x + x2 = 0 + 12.6

Combine like terms: 0 + 12.6 = 12.6
4x + x2 = 12.6

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = 12.6 + 4

Reorder the terms:
4 + 4x + x2 = 12.6 + 4

Combine like terms: 12.6 + 4 = 16.6
4 + 4x + x2 = 16.6

Factor a perfect square on the left side:
(x + 2)(x + 2) = 16.6

Calculate the square root of the right side: 4.074309757

Break this problem into two subproblems by setting 
(x + 2) equal to 4.074309757 and -4.074309757.

Subproblem 1

x + 2 = 4.074309757 Simplifying x + 2 = 4.074309757 Reorder the terms: 2 + x = 4.074309757 Solving 2 + x = 4.074309757 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 4.074309757 + -2 Combine like terms: 2 + -2 = 0 0 + x = 4.074309757 + -2 x = 4.074309757 + -2 Combine like terms: 4.074309757 + -2 = 2.074309757 x = 2.074309757 Simplifying x = 2.074309757

Subproblem 2

x + 2 = -4.074309757 Simplifying x + 2 = -4.074309757 Reorder the terms: 2 + x = -4.074309757 Solving 2 + x = -4.074309757 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -4.074309757 + -2 Combine like terms: 2 + -2 = 0 0 + x = -4.074309757 + -2 x = -4.074309757 + -2 Combine like terms: -4.074309757 + -2 = -6.074309757 x = -6.074309757 Simplifying x = -6.074309757

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.074309757, -6.074309757}

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