Introduction to Linear Polynomials | Exercise 2.1

Question 3

What are the coefficients of x2x^2 and x3x^3 in the polynomial x43x3+6x22x+7x^4 - 3x^3 + 6x^2 - 2x + 7?

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Solution

We will identify the numerical part of the terms containing x2x^2 and x3x^3.

Step 1 — Identify the polynomial

Let's look at the given polynomial. It is x43x3+6x22x+7x^4 - 3x^3 + 6x^2 - 2x + 7. We need to find specific coefficients.

P(x)=x43x3+6x22x+7P(x) = x^4 - 3x^3 + 6x^2 - 2x + 7

Diagram 1

Step 2 — Find the coefficient of x3x^3

Let's find the term with x3x^3. The term is 3x3-3x^3. The number multiplying x3x^3 is its coefficient.

The term containing x3 is 3x3\text{The term containing } x^3 \text{ is } -3x^3 The coefficient of x3 is 3\text{The coefficient of } x^3 \text{ is } -3

Coefficient of x3=3\boxed{\text{Coefficient of } x^3 = -3}

Step 3 — Find the coefficient of x2x^2

Now, let's find the term with x2x^2. The term is 6x26x^2. The number multiplying x2x^2 is its coefficient.

The term containing x2 is 6x2\text{The term containing } x^2 \text{ is } 6x^2 The coefficient of x2 is 6\text{The coefficient of } x^2 \text{ is } 6

Coefficient of x2=6\boxed{\text{Coefficient of } x^2 = 6}

Answer

(i) The coefficient of x3x^3 is -3. (ii) The coefficient of x2x^2 is 6.

More questions in Exercise 2.1

Q1

Find the degrees of the following polynomials:

(i) 2x25x+32x^2 - 5x + 3

(ii) y3+2y1y^3 + 2y - 1

(iii) 9-9

(iv) 4z34z - 3

Q2

Write polynomials of degrees 1, 2 and 3.

Q3

What are the coefficients of x2x^2 and x3x^3 in the polynomial x43x3+6x22x+7x^4 - 3x^3 + 6x^2 - 2x + 7?

Q4

What is the coefficient of zz in the polynomial 4z3+5z2114z^3 + 5z^2 - 11?

Q5

What is the constant term of the polynomial 9x3+5x28x109x^3 + 5x^2 - 8x - 10?

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