x^2+16x+66=123

Solution for x^2+16x+66=123 equation:

Simplifying
x2 + 16x + 66 = 123

Reorder the terms:
66 + 16x + x2 = 123

Solving
66 + 16x + x2 = 123

Solving for variable 'x'.

Reorder the terms:
66 + -123 + 16x + x2 = 123 + -123

Combine like terms: 66 + -123 = -57
-57 + 16x + x2 = 123 + -123

Combine like terms: 123 + -123 = 0
-57 + 16x + x2 = 0

Factor a trinomial.
(-19 + -1x)(3 + -1x) = 0

Subproblem 1
Set the factor '(-19 + -1x)' equal to zero and attempt to solve:

Simplifying
-19 + -1x = 0

Solving
-19 + -1x = 0

Move all terms containing x to the left, all other terms to the right.

Add '19' to each side of the equation.
-19 + 19 + -1x = 0 + 19

Combine like terms: -19 + 19 = 0
0 + -1x = 0 + 19
-1x = 0 + 19

Combine like terms: 0 + 19 = 19
-1x = 19

Divide each side by '-1'.
x = -19

Simplifying
x = -19
Subproblem 2
Set the factor '(3 + -1x)' equal to zero and attempt to solve:

Simplifying
3 + -1x = 0

Solving
3 + -1x = 0

Move all terms containing x to the left, all other terms to the right.

Add '-3' to each side of the equation.
3 + -3 + -1x = 0 + -3

Combine like terms: 3 + -3 = 0
0 + -1x = 0 + -3
-1x = 0 + -3

Combine like terms: 0 + -3 = -3
-1x = -3

Divide each side by '-1'.
x = 3

Simplifying
x = 3
Solution
x = {-19, 3}