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