Question

what is the value of the expression below when z = 5? 3z^2 + z - 4 answer attempt 1 out of 2

Explanation:

Step1: Calculate $z^2$

Given $z = 5$, then $z^2=5^2 = 25$.

Step2: Calculate $3z^2$

Since $z^2 = 25$, then $3z^2=3\times25 = 75$.

Step3: Substitute values into the expression

The original expression $3z^2+z - 4$ becomes $75 + 5-4$.

Step4: Perform addition and subtraction

$75+5-4=80 - 4=76$.

Answer:

76