Answer: The correct option is (c) 70.
Step-by-step explanation: We are given to find the value of the following expression for b = 5 :
[tex]E=3b^2-b~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(i)[/tex]
To find the value of the expression (i) at b = 5, we need to substitute b = 5 in (i).
Substituting b = 5 in (i), we get
[tex]E\\\\=3b^2-b\\\\=3\times5^2-5\\\\=75-5\\\\=70.[/tex]
Thus, the required value of the the given expression is 70.
Option (c) is CORRECT.
