Question

(5x-7y)cube+(5x+7y)cube

Answer 1

Hi ,

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( a - b )³ + ( a + b )³ = 2[ a³ + 3ab² ]

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Here ,

a = 5x , b = 7y

( 5x - 7y )³ + ( 5x + 7y )³

= 2 [ ( 5x )³ + 3 × 5x × ( 7y )² ]

= 2 [ 125x³ + 15 x × 49y² ]

= 2[ 125 x³ + 735xy² ]

= 250x³ + 1470xy²

I hope this helps you.

: )

Answer 2

HEY MATE HERE IS YOUR [Tex]\mathbb{Answer}[/tex]

$(5x-7y)^{3} +(5x+7y)^{3}$