a(10+a)=25

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Solution for a(10+a)=25 equation:


Simplifying
a(10 + a) = 25
(10 * a + a * a) = 25
(10a + a2) = 25

Solving
10a + a2 = 25

Solving for variable 'a'.

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

Combine like terms: 25 + -25 = 0
-25 + 10a + a2 = 0

Begin completing the square.

Move the constant term to the right:

Add '25' to each side of the equation.
-25 + 10a + 25 + a2 = 0 + 25

Reorder the terms:
-25 + 25 + 10a + a2 = 0 + 25

Combine like terms: -25 + 25 = 0
0 + 10a + a2 = 0 + 25
10a + a2 = 0 + 25

Combine like terms: 0 + 25 = 25
10a + a2 = 25

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 = 25 + 25

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

Combine like terms: 25 + 25 = 50
25 + 10a + a2 = 50

Factor a perfect square on the left side:
(a + 5)(a + 5) = 50

Calculate the square root of the right side: 7.071067812

Break this problem into two subproblems by setting 
(a + 5) equal to 7.071067812 and -7.071067812.

Subproblem 1

a + 5 = 7.071067812 Simplifying a + 5 = 7.071067812 Reorder the terms: 5 + a = 7.071067812 Solving 5 + a = 7.071067812 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 = 7.071067812 + -5 Combine like terms: 5 + -5 = 0 0 + a = 7.071067812 + -5 a = 7.071067812 + -5 Combine like terms: 7.071067812 + -5 = 2.071067812 a = 2.071067812 Simplifying a = 2.071067812

Subproblem 2

a + 5 = -7.071067812 Simplifying a + 5 = -7.071067812 Reorder the terms: 5 + a = -7.071067812 Solving 5 + a = -7.071067812 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 = -7.071067812 + -5 Combine like terms: 5 + -5 = 0 0 + a = -7.071067812 + -5 a = -7.071067812 + -5 Combine like terms: -7.071067812 + -5 = -12.071067812 a = -12.071067812 Simplifying a = -12.071067812

Solution

The solution to the problem is based on the solutions from the subproblems. a = {2.071067812, -12.071067812}

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