a^2+4a=25

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Solution for a^2+4a=25 equation:


Simplifying
a2 + 4a = 25

Reorder the terms:
4a + a2 = 25

Solving
4a + a2 = 25

Solving for variable 'a'.

Reorder the terms:
-25 + 4a + a2 = 25 + -25

Combine like terms: 25 + -25 = 0
-25 + 4a + a2 = 0

Begin completing the square.

Move the constant term to the right:

Add '25' to each side of the equation.
-25 + 4a + 25 + a2 = 0 + 25

Reorder the terms:
-25 + 25 + 4a + a2 = 0 + 25

Combine like terms: -25 + 25 = 0
0 + 4a + a2 = 0 + 25
4a + a2 = 0 + 25

Combine like terms: 0 + 25 = 25
4a + a2 = 25

The a term is 4a.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4a + 4 + a2 = 25 + 4

Reorder the terms:
4 + 4a + a2 = 25 + 4

Combine like terms: 25 + 4 = 29
4 + 4a + a2 = 29

Factor a perfect square on the left side:
(a + 2)(a + 2) = 29

Calculate the square root of the right side: 5.385164807

Break this problem into two subproblems by setting 
(a + 2) equal to 5.385164807 and -5.385164807.

Subproblem 1

a + 2 = 5.385164807 Simplifying a + 2 = 5.385164807 Reorder the terms: 2 + a = 5.385164807 Solving 2 + a = 5.385164807 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + a = 5.385164807 + -2 Combine like terms: 2 + -2 = 0 0 + a = 5.385164807 + -2 a = 5.385164807 + -2 Combine like terms: 5.385164807 + -2 = 3.385164807 a = 3.385164807 Simplifying a = 3.385164807

Subproblem 2

a + 2 = -5.385164807 Simplifying a + 2 = -5.385164807 Reorder the terms: 2 + a = -5.385164807 Solving 2 + a = -5.385164807 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + a = -5.385164807 + -2 Combine like terms: 2 + -2 = 0 0 + a = -5.385164807 + -2 a = -5.385164807 + -2 Combine like terms: -5.385164807 + -2 = -7.385164807 a = -7.385164807 Simplifying a = -7.385164807

Solution

The solution to the problem is based on the solutions from the subproblems. a = {3.385164807, -7.385164807}

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