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Published on: 26/07/2019
Polynomials
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Questions + Answers key
Take MCQ Mathematics Test

1.
Find the zero of the polynomial in each of the following cases: \(p(x)=x+5\)
2.
Verify whether the following are zeroes of the polynomial, indicated against them.
\(p(x)=3x+1,x=-\frac { 1 }{ 3 } \)
3.
Classify the following as linear, quadratic and cubic polynomials:
y + y2 + 4
4.
Write the degree of the following polynomials:
4 - y2
5.
Which of the following expressions are polynomials in one variable and which are not? State reasons for your answer.
\({ 4x }^{ 2 }-3x+7\)
6.
Prove that \((a+b)^3+(b+c)^3+(c+a)^3-3(a+b)(b+c)(c+a)\) = \(2(a^3+b^3+c^3-3abc)\)
7.
Write the various coefficients in the following polynomials:
1 - 2y + 3y6
8.
Verify whether 2 and 0 are zeroes polynomial \(x^2-2x\)
9.
Chech whether -2 and 2 are zeroes of the polynomial x+2.
10.
Find a zero of the polynomial p(x)=2x+1
11.
Point out which of the following polynomials are monomials, binomials or trinomials?
8
12.
Write the coefficient of x3 of the following polynomials:
\(\frac { 2 }{ 3 } -\frac { 5 }{ 4 } x+{ x }^{ 3 }+\frac { 1 }{ 2 } { x }^{ 2 }\)
13.
The degree of the polynomial \(p(x)=(x-7)^3-x^3\) is:
3
2
1
0
14.
The degree of the polynomial \((x^3+5)(4-x^5)\) is:
5
3
8
2
15.
Degree of polynomial \((x^3+5)(4-x^5)\) is:
0
5
3
2
16.
The degree of the polynomial \(2-y^2-y^3+2y^7\) is:
2
7
0
3
17.
Degree of the polynomial \(p(x)=4x^4+2x^3+x^5+2x+7\) is:
7
4
5
3
18.
The number 0 is called a
zero polynomial
binomial
trinomial
linear polynomial
19.
Select the correct statement from the following:
Degree of a zero polynomial is zero.
Degree of a zero polynomial is not defined.
Degree of a constant polynomial is not defined
Zero of the polynomial is not defined
20.
The compact form of (x+y)(x-y) is
\((x+y)(x-y)=x^2-y^2\) is an algebraic identity
\(x^2+y^2\)
\(x^2-2xy+y^2\)
\(x^2+2xy+y^2\)
\(x^2-y^2\)
21.
The expansion for \((x-y)^2\) is
\((x-y)^2=x^2-2xy+y^2\) is an algebraic identity
\(x^2-2xy+y^2\)
\(x^2+2xy+y^2\)
\(x^2+y^2\)
\(x^2-y^2\)
22.
Which of the following is an algebraic identity?
\((x+y)^2=x^2+2xy+y^2\) is an algebraic identity
\((x+y)^2=x^2-2xy+y^2\)
\((x+y)^2=x^2+2xy-y^2\)
\((x+y)^2=x^2+2xy+y^2\)
\((x+y)^2=-x^2+2xy+y^2\)
23.
Write an example of a constant polynomial.
24.
What is x+\(\frac { 1 }{ x } \)?
25.
Name the degree of the polynomial -3x+2.
26.
What is the degree of a zero polynomial?
27.
Write the expression which represents polynomial.
1.
\( p(x)=x+5\)
\(\\ p(x)=0\)
\(\\ \Rightarrow x+5=0\ \Rightarrow \ x=-5\)
\(\therefore -5\)\(x = {-b \pm \sqrt{b^2-4ac} \over 2a}\) is a zero of the polynomial p(x).
2.
\(p\left( -\frac { 1 }{ 3 } \right) =3\left( -\frac { 1 }{ 3 } \right) +1=-1+1=0\)
\(\therefore -\frac { 1 }{ 3 } \) is a zero of p(x)
3.
quadratic
4.
Term with the highest power of y = - y2
Exponent of y in this term = 2
Therefore Degree of this polynomial = 2
5.
This expression is a polynomial in one variable x because in the expression there is only one variable (x) and all the indices of x are whole numbers.
6.
L.H.S=\((a+b)^3+(b+c)^3+(c+a)^3-3(a+b)(b+c)(c+a)\)
\(=\left\{ (a+b)+(b+c)+(c+a) \right\} [(a+b)^2+(b+c)^2+(c+a)^2-(a+b)(b+c-(b_c)(c+a)-(c+a)(a+b)]\)
\(=2(a+b+c)[a^2+2ab+b^2+b^2+2bc+c^2+c^2+2ca+c^2-ab-ac-b^2-bc-bc-ba-c^2-ca-ca-cb-a^2-ab]\)
Using Identity I
\(=2(a+b+c)(a^2+b^2+c^2-ab-bc-ca)\)
\(=2(a^3+b^3+c^3-3abc)\)Using Identity VIII
7.
1, -2, 3
8.
Let p(x) = x2 – 2x
Then p(2) = 22 – 4 = 4 – 4 = 0
and p(0) = 0 – 0 = 0
Hence, 2 and 0 are both zeroes of the polynomial x2 – 2x.
9.
Let p(x) = x + 2.
Then p(2) = 2 + 2 = 4, p(–2) = –2 + 2 = 0
Therefore, –2 is a zero of the polynomial x + 2, but 2 is not.
10.
\(\left(-\frac{1}{2}\right)\)
11.
monomial
12.
1
13.
\((x-7)^3-x^3=-21x^2+147x-343\)
14.
\((x^3+5)(4-x^5)\)\(=4x^3-x^8+20-5x^5\)
15.
Highest power of x=3+2=5
16.
Highest power of y=7
17.
Highest power of x=5
18.
Definition of zero polynomial
19.
Convention
20.
(a)
\(x^2+y^2\)
21.
(a)
\(x^2-2xy+y^2\)
22.
(c)
\((x+y)^2=x^2+2xy+y^2\)
23.
( )
Constant polynomial is 7.
24.
( )
Not a polynomial.
25.
( )
Linear polynomial.
26.
( )
Not defined.
27.
( )
\(\sqrt { 3 } { x }^{ 2 }-x-1\)
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