5x^2-20=3x

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Solution for 5x^2-20=3x equation:


Simplifying
5x2 + -20 = 3x

Reorder the terms:
-20 + 5x2 = 3x

Solving
-20 + 5x2 = 3x

Solving for variable 'x'.

Reorder the terms:
-20 + -3x + 5x2 = 3x + -3x

Combine like terms: 3x + -3x = 0
-20 + -3x + 5x2 = 0

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

Divide each side by '5'.
-4 + -0.6x + x2 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + -0.6x + 4 + x2 = 0 + 4

Reorder the terms:
-4 + 4 + -0.6x + x2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + -0.6x + x2 = 0 + 4
-0.6x + x2 = 0 + 4

Combine like terms: 0 + 4 = 4
-0.6x + x2 = 4

The x term is -0.6x.  Take half its coefficient (-0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
-0.6x + 0.09 + x2 = 4 + 0.09

Reorder the terms:
0.09 + -0.6x + x2 = 4 + 0.09

Combine like terms: 4 + 0.09 = 4.09
0.09 + -0.6x + x2 = 4.09

Factor a perfect square on the left side:
(x + -0.3)(x + -0.3) = 4.09

Calculate the square root of the right side: 2.022374842

Break this problem into two subproblems by setting 
(x + -0.3) equal to 2.022374842 and -2.022374842.

Subproblem 1

x + -0.3 = 2.022374842 Simplifying x + -0.3 = 2.022374842 Reorder the terms: -0.3 + x = 2.022374842 Solving -0.3 + x = 2.022374842 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3' to each side of the equation. -0.3 + 0.3 + x = 2.022374842 + 0.3 Combine like terms: -0.3 + 0.3 = 0.0 0.0 + x = 2.022374842 + 0.3 x = 2.022374842 + 0.3 Combine like terms: 2.022374842 + 0.3 = 2.322374842 x = 2.322374842 Simplifying x = 2.322374842

Subproblem 2

x + -0.3 = -2.022374842 Simplifying x + -0.3 = -2.022374842 Reorder the terms: -0.3 + x = -2.022374842 Solving -0.3 + x = -2.022374842 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3' to each side of the equation. -0.3 + 0.3 + x = -2.022374842 + 0.3 Combine like terms: -0.3 + 0.3 = 0.0 0.0 + x = -2.022374842 + 0.3 x = -2.022374842 + 0.3 Combine like terms: -2.022374842 + 0.3 = -1.722374842 x = -1.722374842 Simplifying x = -1.722374842

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.322374842, -1.722374842}

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