Answer:
52a² - 39a
Step-by-step explanation:
Step 1: Write out expression
3a(4a - 5) - 4a(6 - 10a)
Step 2: Distribute
12a² - 15a - 24a + 40a²
Step 3: Combine like terms (a²)
52a² - 15a - 24a
Step 4: Combine like terms (a)
