Explanation:
(j+2)×(2j+1)
Multiply each term in the first parenthesis by each term in the second parenthesis (FOIL)
j×2j+j+2×2j+2
Calculate the product
2j² + j + 2 × 2j + 2
Calculate the product
2j² + j + 4j + 2
Collect like terms
2j² + 5j +2
Solution: 2j² + 5j + 2