What is the value of this expression below when z=3
10z^2-2z-2

82

Step-by-step explanation:

Evaluate 10z² - 2z - 2 where z = 3:

10z² - 2z - 2 = 10 × 3² - 2 × 3 - 2

3² = 9:

10 × 9 - 2 × 3 - 2

10 × 9 = 90:

90 - 2 × 3 - 2

-2 × 3 = -6:

90 - 6 - 2

90 - 6 - 2 = 90 - (6 + 2):

90 - (6 + 2)

6 + 2 = 8:

90 - 8

82

after simplifying it i got: -36.25 as my answer. hope that !