Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °
You are not logged in.
Post a reply
Topic review (newest first)
- bob bundy
- 2012-10-19 04:55:39
hi danthemaths
Welcome to the forum.
Am I on the right lines?
Not quite.
When you put x = 3 you get a remainder. Let's say
and when x =-1
You are also told that
So make an equation from this and solve for a.
Hope that helps.
?? But I'm not getting a = 4 ??
Bob
- danthemaths
- 2012-10-19 04:03:33
hey guys, I am stuck on this question:
"The Remainder when x^3-2x^2+ax+5 is divided by x-3 is twice the remainder when the same expression is divided by x+1. Find the value of the constant a."
I know the answer is 4 but i dont know how to get there.
I have started it off but dont know what to from then on...
I worked out f(3) to be -14=3a
...and f(-1) to be a=2
Am I on the right lines? and what do I do from then on? this will really help me out
thanks in advance
danthemaths