Question

pqa=(3p+4q)^2-(3p-4q)^2​

Answer 1

Solution:

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We know that,

(x+y)² - (x-y)² = 4xy

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Here,

x = 3p , y = 4q

Now ,

pqa= (3p+4q)²-(3p-4q)²

= 4×(3p)×(4q)

= 4×3×4×pq

= 48pq

Therefore,

a = 48

••••

Answer 2

Answer:

Step-by-step explanation:

(3p + 4q ) ² - (3p - 4q)²

(3p)² + (4q)² + 2(3p)(4q) - { (3p)² + (4q)² - 2(3p)(4q)

9p² + 16q² + 24pq - { 9p² + 16q² - 24pq }

9p² + 16q² + 24pq - 9p² - 16q² + 24pq

9p² nd 16q² got cancelled

24pq + 24pq

= 48pq

Hope it helps

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