3 years ago

PLEASEHELP! ANSWER CHOICES: A)189 B)329 C)161 D)84

Mathematics

1 answer:

kipiarov [429]3 years ago

6 0

Answer:

329

Step-by-step explanation:

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How to solve this?<br> pls help fast...<br><br> (7/9a +9/7b)² -ab

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Step-by-step explanation:

(7/9a+9/7b)^2 -ab

simplifying (7/9a+9/7b)^2

expanding the bracket

$= ( \frac{7}{9a} + \frac{7}{7b} ) \: ( \frac{7}{9a} + \frac{7}{7b} ) - ab$

$= \frac{49}{81 {a}^{2} } + \frac{49}{63ab} + \frac{49}{63ab} + \frac{49}{49 {b}^{2} } - ab$

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factorizing b out

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the l.c.m= (81a^2) (63ab)

multiplying through by the L.C.M

63ab×49 +98×81a^2 +b(b-a) ×81a^2 ×63ab

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