How do I evaluate:

d2 (squared)-3ab

d= -4, a= .5, b= -2

To evaluate the expression d^2 - 3ab, you need to substitute the given values of d, a, and b into the expression and perform the necessary calculations. Here's how you can do it step by step:

1. Replace the variable d with its given value -4:
d^2 - 3ab = (-4)^2 - 3ab

2. Replace the variable a with its given value 0.5:
(-4)^2 - 3ab = 16 - 3(0.5)b

3. Replace the variable b with its given value -2:
16 - 3(0.5)(-2)

4. Perform the multiplication inside the parentheses:
16 - 3(-1)

5. Perform the multiplication of -3 and -1:
16 + 3 = 19

So, when d = -4, a = 0.5, and b = -2, the value of d^2 - 3ab is 19.