Evaluate ab for a=6 and b=-9.

To evaluate ab for a=6 and b=-9, we simply substitute the values of a and b into the expression.

ab = 6 * (-9) = -54

Therefore, ab is equal to -54 when a=6 and b=-9.

To evaluate ab, you simply multiply the values of a and b.

Given a = 6 and b = -9,

ab = 6 * (-9)

Calculating the product, we get:

ab = -54

Therefore, ab = -54 when a = 6 and b = -9.