Final answer:
The value of the expression b² - 12 when b = 8 is 52. This is calculated by squaring 8 to get 64 and then subtracting 12 from it.
Step-by-step explanation:
To find the value of the expression b² - 12 when a = 1/4 and b = 8, you follow these steps:
- First, understand that the value of 'a' is not needed here as it does not appear in the expression.
- Next, substitute the value of 'b' (which is 8) into the expression.
- So, we calculate 8² - 12.
- 8 squared (8²) is 64.
- Then, subtract 12 from 64, which gives us 52.
Therefore, the value of the expression b² - 12 when b = 8 is 52.