a^2-80a+1581=0

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Solution for a^2-80a+1581=0 equation:


Simplifying
a2 + -80a + 1581 = 0

Reorder the terms:
1581 + -80a + a2 = 0

Solving
1581 + -80a + a2 = 0

Solving for variable 'a'.

Begin completing the square.

Move the constant term to the right:

Add '-1581' to each side of the equation.
1581 + -80a + -1581 + a2 = 0 + -1581

Reorder the terms:
1581 + -1581 + -80a + a2 = 0 + -1581

Combine like terms: 1581 + -1581 = 0
0 + -80a + a2 = 0 + -1581
-80a + a2 = 0 + -1581

Combine like terms: 0 + -1581 = -1581
-80a + a2 = -1581

The a term is -80a.  Take half its coefficient (-40).
Square it (1600) and add it to both sides.

Add '1600' to each side of the equation.
-80a + 1600 + a2 = -1581 + 1600

Reorder the terms:
1600 + -80a + a2 = -1581 + 1600

Combine like terms: -1581 + 1600 = 19
1600 + -80a + a2 = 19

Factor a perfect square on the left side:
(a + -40)(a + -40) = 19

Calculate the square root of the right side: 4.358898944

Break this problem into two subproblems by setting 
(a + -40) equal to 4.358898944 and -4.358898944.

Subproblem 1

a + -40 = 4.358898944 Simplifying a + -40 = 4.358898944 Reorder the terms: -40 + a = 4.358898944 Solving -40 + a = 4.358898944 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '40' to each side of the equation. -40 + 40 + a = 4.358898944 + 40 Combine like terms: -40 + 40 = 0 0 + a = 4.358898944 + 40 a = 4.358898944 + 40 Combine like terms: 4.358898944 + 40 = 44.358898944 a = 44.358898944 Simplifying a = 44.358898944

Subproblem 2

a + -40 = -4.358898944 Simplifying a + -40 = -4.358898944 Reorder the terms: -40 + a = -4.358898944 Solving -40 + a = -4.358898944 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '40' to each side of the equation. -40 + 40 + a = -4.358898944 + 40 Combine like terms: -40 + 40 = 0 0 + a = -4.358898944 + 40 a = -4.358898944 + 40 Combine like terms: -4.358898944 + 40 = 35.641101056 a = 35.641101056 Simplifying a = 35.641101056

Solution

The solution to the problem is based on the solutions from the subproblems. a = {44.358898944, 35.641101056}

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