54=x(3+x)

Solution for 54=x(3+x) equation:

Simplifying
54 = x(3 + x)
54 = (3 * x + x * x)
54 = (3x + x2)

Solving
54 = 3x + x2

Solving for variable 'x'.

Reorder the terms:
54 + -3x + -1x2 = 3x + -3x + x2 + -1x2

Combine like terms: 3x + -3x = 0
54 + -3x + -1x2 = 0 + x2 + -1x2
54 + -3x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
54 + -3x + -1x2 = 0

Factor a trinomial.
(6 + -1x)(9 + x) = 0

Subproblem 1
Set the factor '(6 + -1x)' equal to zero and attempt to solve:

Simplifying
6 + -1x = 0

Solving
6 + -1x = 0

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

Add '-6' to each side of the equation.
6 + -6 + -1x = 0 + -6

Combine like terms: 6 + -6 = 0
0 + -1x = 0 + -6
-1x = 0 + -6

Combine like terms: 0 + -6 = -6
-1x = -6

Divide each side by '-1'.
x = 6

Simplifying
x = 6
Subproblem 2
Set the factor '(9 + x)' equal to zero and attempt to solve:

Simplifying
9 + x = 0

Solving
9 + x = 0

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

Add '-9' to each side of the equation.
9 + -9 + x = 0 + -9

Combine like terms: 9 + -9 = 0
0 + x = 0 + -9
x = 0 + -9

Combine like terms: 0 + -9 = -9
x = -9

Simplifying
x = -9
Solution
x = {6, -9}