Question

What is the value of 12x^-3y^-1 for x=-1 and y=5?

1. -12/5
2. -180
3. -60
4. -5/12

Answer 1

Answer: -12/5

Step-by-step explanation: The given expression is

We can rewrite as positive index to get,

We substitute x=-1 and y=5.

Answer 2

`- (12)/(5)`

Step-by-step explanation

The given expression is

`12 {x}^( - 3) {y}^( - 1)`

We can rewrite as positive index to get,

`\frac{12}{ {x}^(3) } * (1)/(y)`

`= \frac{12}{ {x}^(3)y}`

We substitute x=-1 and y=5.

`= \frac{12}{( { - 1}^(3)) * 5 }`

`= (12)/( - 5) = - (12)/(5)`