What is the value of the expression below when z=6
2z^2 -8z-2

22

Step-by-step explanation:

Substitute: 2 · 6² - 8 · 6 - 2

Calculate the power: 2 × 36 - 8 × 6 - 2

Calculate the product or quotient: 72 - 8 × 6 - 2

Calculate the product or quotient: 72 - 48 - 2

Reorder and group certain terms: ( 72 - 2 ) - 48

Calculate: 70 - 48

Calculate the sum or difference: 22

22

d. 8

step-by-step explanation:

the given radical expression is:

we can rewrite this as:

we express as square numbers to get;

the exponents will now cancel out to give.

the correct answer is d