Questions · Page 3 of 4

[2 Mark Question Answer]

Question 1012 Marks
Factorise:
$\frac{8 a^3}{27}-\frac{b^3}{8}$
Answer
$\left(\frac{2 a}{3}-\frac{b}{2}\right)\left(\frac{4 a^2}{9}+\frac{a b}{3}+\frac{b^2}{4}\right)$
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Question 1022 Marks
Factorise:
$8 a^3-\frac{1}{27 b^3}$
Answer
$\left(2 a-\frac{1}{3 b}\right)\left(4 a^2+\frac{2 a}{3 b}+\frac{1}{9 b^2}\right)$
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Question 1092 Marks
Factorise:
$216 x^3+\frac{1}{27}$
Answer
$\left(6 x+\frac{1}{3}\right)\left(36 x^2-2 x+\frac{1}{9}\right)$
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Question 1172 Marks
Factorise:
$9 a^2+3 a-8 b-64 b^2$ [
Hint.
Given Exp. $\left.=\left(9 a^2-64 b^2\right)+(3 a-8 b)\right]$
Answer
(3a - 8b) (3a + 8b + 1)
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Question 1182 Marks
Factorise:
$4 x^2-12 a x-y^2-z^2-2 y z+9 a^2 \quad\left[\right.$ Hint. Given Exp. $\left.=\left(4 x^2-12 a x+9 a^2\right)-\left(y^2+z^2+2 y z\right)\right]$
Answer
(2x - 3a + y + z) (2x - 3a - y - z)
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Question 1192 Marks
Factorise:
$\left(a^2-b^2\right)\left(c^2-d^2\right)-4 a b c d \quad\left[\right.$ Hint. Given Exp $\left.=(a c-b d)^2-(a d+b c)^2\right]$
Answer
(ac - bd + ad + bc) (ac - bd - ad - bc)
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Question 1212 Marks
Factorise:
$x^4+5 x^2+9$ [Hint. Add and subtract $x^2$ ]
Answer
$\left(x^2+3+x\right)\left(x^2+3-x\right)$
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Question 1222 Marks
Factorise:
$x^2+\frac{1}{x^2}-11$ [Hint. Given Exp. $=\left(x^2+\frac{1}{x^2}-2\right)-9$ ]
Answer
$\left(x-\frac{1}{x}+3\right)\left(x-\frac{1}{x}-3\right)$
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Question 1472 Marks
Factorise:
$x^2+\frac{1}{x^2}-2-3 x+\frac{3}{x}$
Answer
$\left(x-\frac{1}{x}\right)\left(x-\frac{1}{x}-3\right)$
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[2 Mark Question Answer] - Page 3 - MATHEMATICS STD 9 Questions - Vidyadip