Math Is Fun Forum

mathxyz

Member

From: Brooklyn, NY

Registered: 2024-02-24

Posts: 1,053

Find Values of A and B

If f(x) = (x - B)/(x - A), f(2) = 0 and f(-1) is undefined, what are the Values of A amd B?

Bob

Administrator

Registered: 2010-06-20

Posts: 10,640

Re: Find Values of A and B

Put x=-1 in x-A = 0 to get A.

Put x = 2 in x-B = 0 to get B.

Bob

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Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you!  …………….Bob

mathxyz

Member

From: Brooklyn, NY

Registered: 2024-02-24

Posts: 1,053

Re: Find Values of A and B

Put x=-1 in x-A = 0 to get A.

Put x = 2 in x-B = 0 to get B.

Bob

Thanks. I will solve it later on my lunch break at the job. It will give me something to do.

mathxyz

Member

From: Brooklyn, NY

Registered: 2024-02-24

Posts: 1,053

Re: Find Values of A and B

Put x=-1 in x-A = 0 to get A.

Put x = 2 in x-B = 0 to get B.

Bob

x - A = 0

-1 - A = 0

-A = 1

A = 1/-1

A = -1

x - B = 0

2 - B = 0

-B = -2

B = -2/-1

B = 2

Yes?

Bob

Administrator

Registered: 2010-06-20

Posts: 10,640

Re: Find Values of A and B

Correct.
B

---

Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you!  …………….Bob

mathxyz

Member

From: Brooklyn, NY

Registered: 2024-02-24

Posts: 1,053

Re: Find Values of A and B

Correct.
B

The question itself looks tricky but it's actually easy as pie.

Last edited by mathxyz (2024-03-11 01:47:10)