Question

Evaluate aa when a equals -2.

1)-4
2)4
3)1/4
4)-1/4

Answer 1

a= -2
aa= -2(-2)= 4
Hence, the correct answer is the second option, 4.

Answer 2

For this case we have:

Let

`a = -2`

If we want the result of the product
`a * a`, we have:

`a * a = (- 2) (- 2)`

The law of multiplication of signs states that:

- * - = +

- * + = -

+ * - = -

+ * + = +

Also,
`2 * 2 = 4`

So, we have to evaluate
`a = -2`, the product
`a * a` is given by:

`a * a = + 4`

Answer:

Option 2