Question

Please answer this question​

Answer 1

see explanation

Explanation:

(a)

`(3)/(7)` a × -
`(21)/(15)` b ( cancel 3 and 15 and 7 and 21 )

= a × -
`(3)/(5)` b

= -
`(3)/(5)` ab

(b)

3xy(5x²y² - 4yz) ← multiply each term in the parenthesis by 3xy

= 15x³y³ - 12xy²z