Question

Find the value of the expressions if n = 4.

1) 2n - 7
2) 3n² + 2n - 5
3) -m³

Answer 1

Explanation:

Substitute n = 4 into the expression:

`2(4)-7`

Solve:

`8-7`

`1`

Substitute n = 4 into the expression:

`3(4)^(2) +2(4)-5`

Solve:

`48+8-5`

`56-5`

`51`

Substitute n = 4 into the expression:

Is the expression
`-n^(3) ?`

`-4^(3)`

Multiply:

`-4 * -4 * -4= -64`