a^2-5a=10

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Solution for a^2-5a=10 equation:


Simplifying
a2 + -5a = 10

Reorder the terms:
-5a + a2 = 10

Solving
-5a + a2 = 10

Solving for variable 'a'.

Reorder the terms:
-10 + -5a + a2 = 10 + -10

Combine like terms: 10 + -10 = 0
-10 + -5a + a2 = 0

Begin completing the square.

Move the constant term to the right:

Add '10' to each side of the equation.
-10 + -5a + 10 + a2 = 0 + 10

Reorder the terms:
-10 + 10 + -5a + a2 = 0 + 10

Combine like terms: -10 + 10 = 0
0 + -5a + a2 = 0 + 10
-5a + a2 = 0 + 10

Combine like terms: 0 + 10 = 10
-5a + a2 = 10

The a term is -5a.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5a + 6.25 + a2 = 10 + 6.25

Reorder the terms:
6.25 + -5a + a2 = 10 + 6.25

Combine like terms: 10 + 6.25 = 16.25
6.25 + -5a + a2 = 16.25

Factor a perfect square on the left side:
(a + -2.5)(a + -2.5) = 16.25

Calculate the square root of the right side: 4.031128874

Break this problem into two subproblems by setting 
(a + -2.5) equal to 4.031128874 and -4.031128874.

Subproblem 1

a + -2.5 = 4.031128874 Simplifying a + -2.5 = 4.031128874 Reorder the terms: -2.5 + a = 4.031128874 Solving -2.5 + a = 4.031128874 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + a = 4.031128874 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + a = 4.031128874 + 2.5 a = 4.031128874 + 2.5 Combine like terms: 4.031128874 + 2.5 = 6.531128874 a = 6.531128874 Simplifying a = 6.531128874

Subproblem 2

a + -2.5 = -4.031128874 Simplifying a + -2.5 = -4.031128874 Reorder the terms: -2.5 + a = -4.031128874 Solving -2.5 + a = -4.031128874 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + a = -4.031128874 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + a = -4.031128874 + 2.5 a = -4.031128874 + 2.5 Combine like terms: -4.031128874 + 2.5 = -1.531128874 a = -1.531128874 Simplifying a = -1.531128874

Solution

The solution to the problem is based on the solutions from the subproblems. a = {6.531128874, -1.531128874}

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