a^2-16a-66=10

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Solution for a^2-16a-66=10 equation:


Simplifying
a2 + -16a + -66 = 10

Reorder the terms:
-66 + -16a + a2 = 10

Solving
-66 + -16a + a2 = 10

Solving for variable 'a'.

Reorder the terms:
-66 + -10 + -16a + a2 = 10 + -10

Combine like terms: -66 + -10 = -76
-76 + -16a + a2 = 10 + -10

Combine like terms: 10 + -10 = 0
-76 + -16a + a2 = 0

Begin completing the square.

Move the constant term to the right:

Add '76' to each side of the equation.
-76 + -16a + 76 + a2 = 0 + 76

Reorder the terms:
-76 + 76 + -16a + a2 = 0 + 76

Combine like terms: -76 + 76 = 0
0 + -16a + a2 = 0 + 76
-16a + a2 = 0 + 76

Combine like terms: 0 + 76 = 76
-16a + a2 = 76

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 = 76 + 64

Reorder the terms:
64 + -16a + a2 = 76 + 64

Combine like terms: 76 + 64 = 140
64 + -16a + a2 = 140

Factor a perfect square on the left side:
(a + -8)(a + -8) = 140

Calculate the square root of the right side: 11.832159566

Break this problem into two subproblems by setting 
(a + -8) equal to 11.832159566 and -11.832159566.

Subproblem 1

a + -8 = 11.832159566 Simplifying a + -8 = 11.832159566 Reorder the terms: -8 + a = 11.832159566 Solving -8 + a = 11.832159566 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 = 11.832159566 + 8 Combine like terms: -8 + 8 = 0 0 + a = 11.832159566 + 8 a = 11.832159566 + 8 Combine like terms: 11.832159566 + 8 = 19.832159566 a = 19.832159566 Simplifying a = 19.832159566

Subproblem 2

a + -8 = -11.832159566 Simplifying a + -8 = -11.832159566 Reorder the terms: -8 + a = -11.832159566 Solving -8 + a = -11.832159566 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 = -11.832159566 + 8 Combine like terms: -8 + 8 = 0 0 + a = -11.832159566 + 8 a = -11.832159566 + 8 Combine like terms: -11.832159566 + 8 = -3.832159566 a = -3.832159566 Simplifying a = -3.832159566

Solution

The solution to the problem is based on the solutions from the subproblems. a = {19.832159566, -3.832159566}

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