The expression should be 6(9x+5)
Given information;
The equation is 54x + 30
Calculation of an expression:
A polynomial represents an expression that comprises of indeterminates and coefficients, which includes only the operations of addition, subtraction, multiplication, and a non-negative integer.
So,
= 54x + 30
Learn more about the expression here; https://brainly.com/question/24526981
