Maths Algebra - Class 8 Chapter 9 Identities Set 3

Question 1

The area of a rectangle whose length and breadth are $9x$ and $3x^2$ respectively is

Accepted Answer

$27x^3$

Answer

$4x^3$

Answer

$9x^3$

Answer

$13y^3$

Question 2

The volume of a cube of side 4a is

Accepted Answer

$64a^3$

Answer

$4a^2$

Answer

$2a3$

Answer

$8a^3$

Question 3

The product of $x^2,-x^3, -x^4$ is

Accepted Answer

$x^9$

Answer

$x^5$

Answer

$x^6$

Answer

$x^7$

Question 4

$(x-y)(x+y)+(y-z)(y+z)+(z-x)(z+x)$ is equal to

Accepted Answer

0

Answer

$x^2+y^2+z^2$

Answer

$x+y+z$

Answer

$xy+yz+zx$

Question 5

If we subtract 4a-7ab+3b+12 from 12a-9ab+5b-3, then the answer is

Accepted Answer

8a-2ab+2b-15

Answer

8a+2ab+2b+15

Answer

8a-2ab-2b+15

Answer

8a+2ab-2b-15

Question 6

If we multiply $5x$ and $(-4xyz)$, then we get

Accepted Answer

$-20x^2yz$

Answer

$x^2yz$

Answer

$20x^2yz$

Answer

0

Question 7

Find the value of a, if $8a=35^2-27^2$

Accepted Answer

62

Answer

50

Answer

72

Answer

98

Question 8

Find the value $\frac{198	imes 198-102	imes 102}{96}$

Accepted Answer

300

Answer

100

Answer

200

Answer

400

Question 9

$x-\frac{1}{x}=7$ , Then Find $x^2-\frac{1}{x^2}=?$

Accepted Answer

51

Answer

49

Answer

64

Answer

78

Question 10

If a+b=12 and ab=22, Find $a^2+b^2$

Accepted Answer

100

Answer

200

Answer

250

Answer

280

CHAPTER-9 ALGEBRAIC EXPRESSION AND IDENTITIES (SET-3)

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