Use the distributive property to remove the parentheses
(4n^2+2n-1)3

Answer:
The answer to your question is 12n² + 6n - 3
Step-by-step explanation:
Polynomial
3(4n² + 2n - 1)
Distributive property, this property lets us multiply a sum by multiplying each term of the sum separately and if possible simplify like terms.
Solution
3(4n²) + 3(2n) - 3(1)
12n² + 6n - 3