5a^2-2a=23

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Solution for 5a^2-2a=23 equation:


Simplifying
5a2 + -2a = 23

Reorder the terms:
-2a + 5a2 = 23

Solving
-2a + 5a2 = 23

Solving for variable 'a'.

Reorder the terms:
-23 + -2a + 5a2 = 23 + -23

Combine like terms: 23 + -23 = 0
-23 + -2a + 5a2 = 0

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

Divide each side by '5'.
-4.6 + -0.4a + a2 = 0

Move the constant term to the right:

Add '4.6' to each side of the equation.
-4.6 + -0.4a + 4.6 + a2 = 0 + 4.6

Reorder the terms:
-4.6 + 4.6 + -0.4a + a2 = 0 + 4.6

Combine like terms: -4.6 + 4.6 = 0.0
0.0 + -0.4a + a2 = 0 + 4.6
-0.4a + a2 = 0 + 4.6

Combine like terms: 0 + 4.6 = 4.6
-0.4a + a2 = 4.6

The a term is -0.4a.  Take half its coefficient (-0.2).
Square it (0.04) and add it to both sides.

Add '0.04' to each side of the equation.
-0.4a + 0.04 + a2 = 4.6 + 0.04

Reorder the terms:
0.04 + -0.4a + a2 = 4.6 + 0.04

Combine like terms: 4.6 + 0.04 = 4.64
0.04 + -0.4a + a2 = 4.64

Factor a perfect square on the left side:
(a + -0.2)(a + -0.2) = 4.64

Calculate the square root of the right side: 2.154065923

Break this problem into two subproblems by setting 
(a + -0.2) equal to 2.154065923 and -2.154065923.

Subproblem 1

a + -0.2 = 2.154065923 Simplifying a + -0.2 = 2.154065923 Reorder the terms: -0.2 + a = 2.154065923 Solving -0.2 + a = 2.154065923 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '0.2' to each side of the equation. -0.2 + 0.2 + a = 2.154065923 + 0.2 Combine like terms: -0.2 + 0.2 = 0.0 0.0 + a = 2.154065923 + 0.2 a = 2.154065923 + 0.2 Combine like terms: 2.154065923 + 0.2 = 2.354065923 a = 2.354065923 Simplifying a = 2.354065923

Subproblem 2

a + -0.2 = -2.154065923 Simplifying a + -0.2 = -2.154065923 Reorder the terms: -0.2 + a = -2.154065923 Solving -0.2 + a = -2.154065923 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '0.2' to each side of the equation. -0.2 + 0.2 + a = -2.154065923 + 0.2 Combine like terms: -0.2 + 0.2 = 0.0 0.0 + a = -2.154065923 + 0.2 a = -2.154065923 + 0.2 Combine like terms: -2.154065923 + 0.2 = -1.954065923 a = -1.954065923 Simplifying a = -1.954065923

Solution

The solution to the problem is based on the solutions from the subproblems. a = {2.354065923, -1.954065923}

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