a^2-16a+25=0

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Solution for a^2-16a+25=0 equation:


Simplifying
a2 + -16a + 25 = 0

Reorder the terms:
25 + -16a + a2 = 0

Solving
25 + -16a + a2 = 0

Solving for variable 'a'.

Begin completing the square.

Move the constant term to the right:

Add '-25' to each side of the equation.
25 + -16a + -25 + a2 = 0 + -25

Reorder the terms:
25 + -25 + -16a + a2 = 0 + -25

Combine like terms: 25 + -25 = 0
0 + -16a + a2 = 0 + -25
-16a + a2 = 0 + -25

Combine like terms: 0 + -25 = -25
-16a + a2 = -25

The a term is -16a.  Take half its coefficient (-8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
-16a + 64 + a2 = -25 + 64

Reorder the terms:
64 + -16a + a2 = -25 + 64

Combine like terms: -25 + 64 = 39
64 + -16a + a2 = 39

Factor a perfect square on the left side:
(a + -8)(a + -8) = 39

Calculate the square root of the right side: 6.244997998

Break this problem into two subproblems by setting 
(a + -8) equal to 6.244997998 and -6.244997998.

Subproblem 1

a + -8 = 6.244997998 Simplifying a + -8 = 6.244997998 Reorder the terms: -8 + a = 6.244997998 Solving -8 + a = 6.244997998 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + a = 6.244997998 + 8 Combine like terms: -8 + 8 = 0 0 + a = 6.244997998 + 8 a = 6.244997998 + 8 Combine like terms: 6.244997998 + 8 = 14.244997998 a = 14.244997998 Simplifying a = 14.244997998

Subproblem 2

a + -8 = -6.244997998 Simplifying a + -8 = -6.244997998 Reorder the terms: -8 + a = -6.244997998 Solving -8 + a = -6.244997998 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + a = -6.244997998 + 8 Combine like terms: -8 + 8 = 0 0 + a = -6.244997998 + 8 a = -6.244997998 + 8 Combine like terms: -6.244997998 + 8 = 1.755002002 a = 1.755002002 Simplifying a = 1.755002002

Solution

The solution to the problem is based on the solutions from the subproblems. a = {14.244997998, 1.755002002}

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