Answer:
- 18a - 23
Step-by-step explanation:
When there is a “-” in front of an expression in parentheses, change the sign of each term of the expression
- ( 3a + 2 ) - 3 ( 5a + 7 )
- 3a - 2 -3 ( 5a + 7 )
Multiply each term in the parentheses by - 3
- 3 ( 5a + 7 )
- 3 × 5a - 3 × 7
Calculate the product
- 3 × 5a - 3 × 7
- 15a - 3 × 7
Multiply the numbers
- 3 × 5a - 3 × 7
- 15a - 21
Collect like terms by calculating the sum or difference of their coefficients
- 3a - 15a
( - 3 - 15 )a
Calculate the difference
( - 3 - 15 )a
- 18a
Factor out the negative sign from the expression
- 2 - 21
- ( 2 + 21 )
Add the numbers
- ( 2 + 21 )
- 23
Answer
- 18a - 23
