Question

(3x -4y+5)(3x - 4y -5)

Answer 1

Hi friend, Harish here.

Here is your answer:
___________________________________________________

( 3x - 4y + 5 ) ( 3x - 4y - 5)

⇒  [ (3x-4y) +  5] [ (3x-4y) - 5]

We know that, ( a + b ) ( a - b ) = a² - b²

Then,

⇒ (3x -4y)² - (5)²

Now use the identity ( a - b )² = a² + b² - 2ab.

Then,

⇒ ( 9x² + 16y² - 24xy ) - 25

⇒ ( 9x² + 16y² - 24xy - 25)
___________________________________________________

Hope my answer is helpful to you.

Answer 2

Hi!!!

=> (3x-4y+5) (3x-4y-5)

=> 9x^2-12xy-15x-12xy+16y^2+20y+15x-20y-25

=>9x^2+16y^2-25-24xy

=>(3x)^2+(-4y)^2-(5)^2-24xy

Hope it hlpzzz....