Question

if x is equals to x raised to the power 4 minus 2 x raise to power 3 minus 3 x raise to power 2 - 9 x + b is a polynomial such that when it is divided by x minus 1 and x + 1 leaving the remainder 5 and 19 respectively determine the remainders when f x is divided by x minus 2​

Answer 1

Answer:

Step-by-step explanation:

x = 50

Answer 2

Answer:

Step-by-step explanation:

There is theorem known as “Polynomial Remainder Theorem” or “ Bezout’s Theorem”. It is Stated as -

A Polynomial f(x) if divided by a linear polynomial (x-a) leaves remainder which equals f(a).

So , getting back to our question -

f(x)=x4−2x3+3x2−ax+b

So , when it is divided by(x−1) it’ll leave a remainder = f(1) = 5 (Given).

f(1)=14−2×13+3×12−a×1+b=5

=>1−2+3−a+b=5

=>a−b=(−3)….Eqn(1)

Now , Similarly -

f(−1)=(−1)4−2×(−1)3+3×(−1)2−a×(−1)+b=19

=>1+2+3+a+b=19

=>a+b=13….Eqn(2)

Now , adding equations (1) and (2) , We’ll get -

(a+b)+(a−b)=(−3)+13

=>2a=10=>a=5

So , (a+b)=13 implies b=8