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Chapter 2: Q. 84 (page 70)

If f(x)=3x2-Bx+4and f(-1)=12, what is the value of B?

Short Answer

Expert verified

The value ofB=5

Step by step solution

01

Step 1. Given Information 

If f(x)=3x2-Bx+4andf(-1)=12

We have to find the value of B.

02

Step 2. To find the value of B we firstly find the x=-1 by putting  in the given function.

f(-1)=3(-1)2-B(-1)+4f(-1)=3路1+B+4f(-1)=3+B+4f(-1)=7+B

03

Step 3. Now the function is f(-1)=7+B.We know f(-1)=12 so we put the value of f(-1) in the function.

12=7+B

Subtract 7 on both side

12-7=7+B-75=BB=5

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