If $A = 4 x^{2} + y^{2} - 6 x y$ ;
$B = 3 y^{2} + 12 x^{2} + 8 x y$ ;
$C = 6 x^{2} + 8 y^{2} + 6 x y$
Find the (i) $A + B + C$ (ii) $(A - B) - C$

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Solution

(i) $22 x^{2} + 12 y^{2} + 8 x y$
(ii) $- 14 x^{2} - 10 y^{2} - 20 x y$ or $- (14 x^{2} + 10 y^{2} + 20 x y)$

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Similar questions

A = 4 x^{2} + y^{2} - 6 x y, B = 3 y^{2} + 12 x^{2} + 8 x y

C = 6 x^{2} + y^{2} + 6 x y

A + B + C

4 x^{2} + y^{2} - 12 x y + 9 x

3 y^{2} + 9 x^{2} + 6 x y - 7 x

6 x^{2} + 6 y^{2} + 9 x y

What should be subtracted from 2 x^{2} - 4 y^{2} + 6 x y + 10 to obtain - 2 x^{2} - 3 y^{2} + 6 x y + 10 ?

Question 82 (ii)

Subtract

$6 x^{2} - 4 x y + 5 y^{2} f r o m 8 y^{2} + 6 x y - 3 x^{2}$

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