Q. a polynomial of degree 3 if it is divided by x2+x−2 the remainder is 2x−1. if it is divided by x2+x−3, the remainder is 3x−3. the polynomial is
Polynomial Expression: Let's call the polynomial P(x). Since P(x) is of degree 3, we can express it as P(x)=ax3+bx2+cx+d.
Division by First Polynomial: When P(x) is divided by x2+x−2, the remainder is 2x−1. So, P(x)=(x2+x−2)Q(x)+2x−1 for some polynomial Q(x).
Division by Second Polynomial: Similarly, when P(x) is divided by x2+x−3, the remainder is 3x−3. So, P(x)=(x2+x−3)R(x)+3x−3 for some polynomial R(x).
Equating Remainders: The remainders are equal when the divisors are equal, so we set x2+x−2=x2+x−3 and solve for x. But this is incorrect, as the divisors are different and we cannot equate them. We should instead equate the remainders when the same value of x is used.