Fewpal
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Solve :

i. (6a – 5b – 8c) + (15b + 2a – 5c)

ii. (3x + 2y) (7x – 8y) 

iii. (7m – 5n) – (-4n – 11m) 

iv. (11m – 12n + 3p) – (9m + 7n – 8p)

1 Answer

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i. (6a – 5b – 8c) + (15b + 2a – 5c) 

= (6a + 2a) + (-5b + 15b) + (-8c – 5c) 

= 8a + 10b – 13c 

ii. (3x + 2y) (7x – 8y) 

= 3x × (7x – 8y) + 2yx (7x – 8y) 

= 21x2 – 24xy + 14xy – 16y2 

= 21x2 – 10xy – 16y2 

iii. (7m – 5n) – (-4n – 11m) 

= 7m – 5n + 4n + 11m 

= (7m + 11m) + (-5n + 4n) 

= 18m – n 

iv. (11m – 12n + 3p) – (9m + 7n – 8p) 

= 11m – 12n + 3p – 9m – 7n + 8p 

= (11m – 9m) + (-12n – 7n) + (3p + 8p) 

= 2m – 19n + 11p

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