f(x)= 2x-1. 1<x<3

f(x)= x^2+ax+b, lx-2l greater than or equal to 1

so i know that the absolute value means x is greater than or equal to 3 and x is also less than or equal to 1.

so are the answers:

a=-2 and b=2?

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- February 19th 2010, 01:40 PMphalangedetermining a and b
f(x)= 2x-1. 1<x<3

f(x)= x^2+ax+b, lx-2l greater than or equal to 1

so i know that the absolute value means x is greater than or equal to 3 and x is also less than or equal to 1.

so are the answers:

a=-2 and b=2? - February 19th 2010, 01:57 PMicemanfan
Is the question:

What are the values of a and b that make f(x) a continuous function? - February 19th 2010, 02:37 PMphalange
yes. sorry i forgot to add that

- February 19th 2010, 02:45 PMicemanfan
Ok, then you need the limit of the function to be the same when x approaches 1 from the left and from the right, and also the same when x approaches 3 from the left and from the right.

This means

when x = 1 and when x = 3.

Substituting those values of x into the equation, we get these two equations:

Simplifying, we get

You are correct.