Question

Find x: (i) -3(4x + 9) = 21​

Answer 1

x = - 4

Explanation:

given

- 3(4x + 9) = 21 ( divide both sides by - 3 )

`(-3)/(-3)` (4x + 9) =
`(21)/(-3)` ( simplify both sides )

4x + 9 = - 7 ( subtract 9 from both sides )

4x + 9 - 9 = - 7 - 9 ( simplify both sides )

4x = - 16 ( divide both sides by 4 )

`(4)/(4)` x =
`(-16)/(4)` , that is

x = - 4