Question

maths help....
making x subject in a cubic polynomial....

Answer 1

\[f(x)=x^3+2x^2-3x-11\]

Answer 2

show that f(x) =0 and can be rearranged as
\[x=\sqrt{\frac{ 3x + 11 }{ x + 2 }} , x \neq -2\]

Answer 3

the last post is f(x) or just x?

Answer 4

it is x because the question is saying make x subject in the equation f(x)=0...

Answer 5

ok tell me this. do we have to prove f(x) as 0 or is it given that f(x) = 0 ?

bcoz i dnt think u prove f(x) = 0 normally

Answer 6

@Mertsj

Answer 7

bcoz if its already given that f(x) = 0 then this sum is actually quite easy..

Answer 8

\[x^3+2x^2-3x-11=0\]
\[x^3+2x^2=3x+11\]
\[x^2(x+2)=3x+11\]
\[x^2=\frac{3x+11}{x+2}\]
\[x=\sqrt{\frac{3x+11}{x+2}}\]

Answer 9

lol means f(x) WAS 0 ?

Answer 10

:) perfect!!

Answer 11

thank you.....@luckythebest and @Mertsj