a^2+10a-216=0

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Solution for a^2+10a-216=0 equation:


Simplifying
a2 + 10a + -216 = 0

Reorder the terms:
-216 + 10a + a2 = 0

Solving
-216 + 10a + a2 = 0

Solving for variable 'a'.

Begin completing the square.

Move the constant term to the right:

Add '216' to each side of the equation.
-216 + 10a + 216 + a2 = 0 + 216

Reorder the terms:
-216 + 216 + 10a + a2 = 0 + 216

Combine like terms: -216 + 216 = 0
0 + 10a + a2 = 0 + 216
10a + a2 = 0 + 216

Combine like terms: 0 + 216 = 216
10a + a2 = 216

The a term is 10a.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10a + 25 + a2 = 216 + 25

Reorder the terms:
25 + 10a + a2 = 216 + 25

Combine like terms: 216 + 25 = 241
25 + 10a + a2 = 241

Factor a perfect square on the left side:
(a + 5)(a + 5) = 241

Calculate the square root of the right side: 15.524174696

Break this problem into two subproblems by setting 
(a + 5) equal to 15.524174696 and -15.524174696.

Subproblem 1

a + 5 = 15.524174696 Simplifying a + 5 = 15.524174696 Reorder the terms: 5 + a = 15.524174696 Solving 5 + a = 15.524174696 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + a = 15.524174696 + -5 Combine like terms: 5 + -5 = 0 0 + a = 15.524174696 + -5 a = 15.524174696 + -5 Combine like terms: 15.524174696 + -5 = 10.524174696 a = 10.524174696 Simplifying a = 10.524174696

Subproblem 2

a + 5 = -15.524174696 Simplifying a + 5 = -15.524174696 Reorder the terms: 5 + a = -15.524174696 Solving 5 + a = -15.524174696 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + a = -15.524174696 + -5 Combine like terms: 5 + -5 = 0 0 + a = -15.524174696 + -5 a = -15.524174696 + -5 Combine like terms: -15.524174696 + -5 = -20.524174696 a = -20.524174696 Simplifying a = -20.524174696

Solution

The solution to the problem is based on the solutions from the subproblems. a = {10.524174696, -20.524174696}

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