Question

When p(x) = x³+ax2+2x+a is divided by x+a the remainder is - a. 0 b. a C. -a d. 2a​

Answer 1

Step-by-step explanation:

Remainder theorem says that,

f(x) is a polynomial of degree n (n ≥ 1) and ‘a’ is any real number. If f(x) is divided by (x – a), then the remainder will be f(a).

Let us solve the following questions on the basis of this remainder theorem.

Let f(x) = x3 – ax2 + 2x – a …(1)

When x3 – ax2 + 2x – a is divided by (x – a).

Now, let’s find out the zero of the linear polynomial, (x – a).

To find zero,

x – a = 0

⇒ x = a

This means that by remainder theorem, when x3 – ax2 + 2x – a is divided by (x – a), the remainder comes out to be f(a).

From equation (1), remainder can be calculated as,

Remainder = f(a)

⇒ Remainder = (a)3 – a(a)2 + 2(a) – a

⇒ Remainder = a3 – a3 + 2a – a

⇒ Remainder = 2a – a

⇒ Remainder = a

∴ the required remainder = a

Answer 2

Answer:

1.a

Step-by-step explanation:

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