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CBSE
Class 9 Maths
Polynomials
Quiz 8
Solution
Q.1.
If $$g (x) = \displaystyle 3x^{2}-2x-5 $$, what is the value of $$g(-1)$$?
0%
$$-4$$
0%
$$-10$$
100%
$$-6$$
0%
$$0$$
Q.2.
For what value of $$k$$, $$-2$$ is a zero of the polynomial
$$3x^2 + 4x + 2k$$?
0%
$$5$$
0%
$$3$$
0%
$$-8$$
0%
$$-2$$
Q.3.
The value of the polynomial $$x^{3} -27$$ when $$x = 3$$ is
0%
$$26$$
0%
$$25$$
0%
$$0$$
0%
$$1$$
Q.4.
$$(a -b)^2 -(a + b)^2$$ is equal to:
0%
$$2ab$$
0%
$$4ab$$
0%
$$6ab$$
0%
$$-4ab$$
Q.5.
Say true or false:
The zeros of the polynomial $$x^{2} - 14x + 49$$ is equal to $$7$$.
0%
True
0%
False
Q.6.
Say true or false:
The zero of $$x-5$$ is $$5$$.
0%
True
0%
False
Q.7.
The value of the polynomial $$7x^{4} + 6x^{2} + x$$ when $$x = -2$$ is
0%
$$131$$
0%
$$132$$
0%
$$134$$
0%
$$136$$
Q.8.
The value of the polynomial $$4x^{2} + 3x - 7$$ at $$x=1$$ is:
0%
$$1$$
0%
$$2$$
0%
$$0$$
0%
None of the above
Q.9.
State the following statement is True or False
The zero of the polynomial $$x + 2 + 4$$ is $$-2$$.
0%
True
0%
False
Q.10.
Using standard identity, find the value of $$102^2$$.
0%
$$10402$$
0%
$$10408$$
0%
$$10204$$
0%
$$10404$$
Q.11.
Using standard identity, find $$(2x-y)^2$$.
0%
$$4x^2+y^2-4xy$$
0%
$$4x^2+y^2+4xy$$
0%
$$2x^2+y^2-4xy$$
0%
$$4x^2+y^2-2xy$$
Q.12.
Using standard identity, find the value of $$(a+2b)^2$$.
0%
$$a^2+2b^2+4ab$$
0%
$$a^2+4b^2+2ab$$
0%
$$a^2+4b^2+4ab$$
0%
$$2a^2+4b^2+4ab$$
Q.13.
The value of the polynomial $$2x^{5} - 5x^{3} - 10x + 9$$ when $$x = -1$$
0%
$$21$$
0%
$$22$$
0%
$$23$$
0%
None of the above
Q.14.
Using standard identity, find the value of $$99^2$$.
0%
9901
0%
9801
0%
1001
0%
9701
Q.15.
Which of the following is correct?
0%
$$(x-y)^2=x^2+2xy-y^2$$
0%
$$(x-y)^2=x^2-2xy+y^2$$
0%
$$(x-y)^2=x^2-y^2$$
0%
$$(x+y)^2=x^2+2xy-y^2$$
Q.16.
Find the value of $$49^2$$ using standard identity.
0%
$$2391$$
0%
$$2401$$
0%
$$2411$$
0%
$$2421$$
Q.17.
Find the value of $$99\times 101$$ using standard identity.
0%
$$9999$$
0%
$$9989$$
0%
$$9979$$
0%
$$1009$$
Q.18.
Square of $$3a-4b$$ is:
0%
$$9a^2+16b^2-24ab$$
0%
$$6a^2-8b^2$$
0%
$$9a^2-16b^2$$
0%
$$9a^2+16b^2+24ab$$
Q.19.
Find the value of $$47\times 53$$.
0%
$$2451$$
0%
$$2471$$
0%
$$2491$$
0%
$$2501$$
Q.20.
Find the value of $$87^2-13^2$$.
0%
$$7300$$
0%
$$7350$$
0%
$$7400$$
0%
$$7450$$
Q.21.
Find the value of $$52^2$$ using standard identity.
0%
$$2604$$
0%
$$2704$$
0%
$$2804$$
0%
$$2904$$
Q.22.
Find the value of $$199\times 201$$.
0%
$$39989$$
0%
$$40001$$
0%
$$39999$$
0%
$$400011$$
Q.23.
Find the value of $$995^2-5^2$$.
0%
$$99000$$
0%
$$9900$$
0%
$$99005$$
0%
$$990000$$
Q.24.
Find the value of $$(a+b)^2-(a-b)^2$$.
0%
$$ab$$
0%
$$2ab$$
0%
$$3ab$$
0%
$$4ab$$
Q.25.
The zero of the polynomial $$2x+1$$ is:
0%
$$x=-\dfrac{1}{2}$$
0%
$$x=-1$$
0%
$$x=-2$$
0%
None of the above
Q.26.
A zero of a polynomial:
0%
needs to be $$0$$.
0%
can be any number including $$0$$.
0%
needs to be an integer.
0%
None of the above
Q.27.
The zero of the polynomial $$3x+5$$ is :
0%
$$\dfrac{-5}{3}$$
0%
$$\dfrac{5}{3}$$
0%
$$\dfrac{1}{2}$$
0%
$$\dfrac{-1}{2}$$
Q.28.
$$\left( 3-\sqrt { 7 } \right) \left( 3+\sqrt { 7 } \right) =$$?
0%
$$4$$
0%
$$2$$
0%
$$6$$
0%
$$8$$
Q.29.
The value of $$(a+b)^2-2(a-b)^2+(a-b)(a+b)$$ is:
0%
$$4ab-b^2$$
0%
$$2ab-b^2$$
0%
$$3ab-b^2$$
0%
$$6ab-2b^2$$
Q.30.
Find the value of $$1.05\times 0.95$$ using standard identity.
0%
$$0.9985$$
0%
$$0.9975$$
0%
$$0.9875$$
0%
$$0.9995$$
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