Page 1 - Worksheet-2 Identity

SAI International School
CLASS - IX

Mathematics
CHAPTER-1: ALGEBRAIC IDENTITY

WORKSHEET - 2
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One of the factors of (1 + 9x) + (81x - 1) is:

a) x – 9 b) 9 – x c) 9x + 1 d) 81x

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2 If x + y = 4, x + y = 12 then x +y is 1

(a) 40 (b) 30 (c) 20 (d) 90

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3 If 16y –k=(4y+ )(4y− ), then the value of k is. 1
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a) 0 b) c) d)
4 2 √2
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4 If x + y = 3, x + y = 5, then x y is ________. 1
5 Multiply 94 x 106 by using suitable identity. 1
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6 If a +b +c=10 and a + b + c = 40, find a b + b c + c a 1
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7 Factorise, 2x +5x-3 1
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8 Find the value of x + y + 6xy +50 when x + y = 2 2
9 Factorise: √3 + 11 + 6√3 2
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10 Factorise: 8a – 125b . 2
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11 Factorise: 5(3x + y) + 6(3x + y) – 8 3
12 . Without actually calculating the cubes, find the value of 3
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(11) + (8) + (–19)
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13 Factorise: 25x – 10x + 1 – 36z 3
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14 Find the value of x + y + x y + xy if = 1 and = 1 . 4
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2+√3 2−√3
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15 If a + b + c = 44 and a + b + c = 8, 4
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find the value of a + b + c – 3abc.
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