This set of Class 9 Maths Chapter 2 Multiple Choice Questions & Answers (MCQs) focuses on “Polynomials in One Variable”.
1. (x-y)2 = __________
a) x2 + 2xy+y2
b) x2 – 2xy+y2
c) x2 – y2
d) x2 + y2
Explanation: We can write (x-y)2 as (x-y) * (x-y) = x2-xy-yx + y2
= x2-2xy + y2.
2. How many terms are there in a polynomial 5x2+2x-2?
Explanation: We can get number of terms by separating them by “+” or “–” sign.
In the given polynomial 5x2+2x-2, if we separate expressions by “+” or “–” sign, we get three separate terms as 5x2, 2x and 2.
Hence we can say that there are three terms in the polynomial 5x2+2x-2.
3. Which of the following is the example of Trinomial?
a) 9x3+ 5x2+7x+2
Explanation: Polynomials only having three terms are called Trinomials.
Hence to find trinomial polynomial, we have to find polynomial which has three terms. We can see that 5x2+2x-2 has three terms namely 5x2, 2x and 2. Hence it is trinomial.
Similarly, polynomials only having one term are called Monomials and polynomials only having two terms are called Binomials.
Sanfoundry Global Education & Learning Series – Mathematics – Class 9.
To practice all chapters and topics of class 9 Mathematics, here is complete set of 1000+ Multiple Choice Questions and Answers.