Question 81 (ii)

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$9 a x + 3 b y - c z, - 5 b y + a x + 3 c z$

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Solution

We have,
$(9 a x + 3 b y - c z) + (- 5 b y + a x + 3 c z)$
$= 9 a x + 3 b y - c z - 5 b y + a x + 3 c z$
$= (9 a x + a x) + (3 b y - 5 b y) + (- c z + 3 c z)$ [grouping like terms]

$= 10 a x - 2 b y + 2 c z$

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Question 81 (ii)

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$9 a x + 3 b y - c z, - 5 b y + a x + 3 c z$

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Question 81 (iv)

Add :

$5 x^{2} - 3 x y + 4 y^{2} - 9, 7 y^{2} + 5 x y - 2 x^{2} + 13$

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Add :

$7 a^{2} b c, - 3 a b c^{2}, 3 a^{2} b c, 2 a b c^{2}$

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