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 :
\(E=3b^2-b~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(i)\)
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
\(E\\\\=3b^2-b\\\\=3\times5^2-5\\\\=75-5\\\\=70.\)
Thus, the required value of the the given expression is 70.
Option (c) is CORRECT.
