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Which is the value of 3b2-b when b=5?
a.20
b.25
c.70
d.75

User Jcmvbkbc
by
8.4k points

2 Answers

4 votes

3b2-b, we can re-write it as 6b-b

Now, substitute for b=5,

6(5)-5 = 30-5 =25

SO, OPTION B WOULD BE THE ANSWER.

User Balaji Dhanasekar
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7.6k points
3 votes

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*5^2-5\\\\=75-5\\\\=70.

Thus, the required value of the the given expression is 70.

Option (c) is CORRECT.

User Rolnn
by
7.6k points
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