If f(x) = 3x^2 -Bx + 4 and f(-1) = 12, what is the value of B?

Must I plug -1 for x in the given trinomial?

Why is 12 given as a result in terms of f(-1)?

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- Jun 11th 2007, 12:48 PM #1

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- Jun 11th 2007, 01:12 PM #2

- Jun 11th 2007, 03:57 PM #3

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- Jun 11th 2007, 04:01 PM #4
well, there are times when you want to find a certain type of function that behaves a certain way for whatever reason, and so using a similar method to this, you can find such a function.

let's say you want to find a cubic polynomial that will go through certain points. you could say that the polynomial is of the form y = ax^3 + bx^2 + cx + d, and use properties like these to find the particular function