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

Question

asked Aug 5, 2021 198k views

2 Answers

Marcelo Lujan · Answer 1 · 2021-08-06T01:24:26+0000

Answer:

82

Explanation:

Evaluate 10z² - 2z - 2 where z = 3:

$\longrightarrow$ 10z² - 2z - 2 = 10 × 3² - 2 × 3 - 2

3² = 9:

$\longrightarrow$ 10 × 9 - 2 × 3 - 2

10 × 9 = 90:

$\longrightarrow$ 90 - 2 × 3 - 2

-2 × 3 = -6:

$\longrightarrow$ 90 - 6 - 2

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

$\longrightarrow$ 90 - (6 + 2)

6 + 2 = 8:

$\longrightarrow$ 90 - 8

$\longrightarrow$ 82