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

$- \frac{12}{5}$

EXPLANATION

The given expression is

$12 {x}^{ - 3} {y}^{ - 1}$

We can rewrite as positive index to get,

$\frac{12}{ {x}^{3} } \times \frac{1}{y}$

$= \frac{12}{ {x}^{3}y}$

We substitute x=-1 and y=5.

$= \frac{12}{( { - 1}^{3}) \times 5 }$

$= \frac{12}{ - 5} = - \frac{12}{5}$

Answer 2

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.