Question

Multiply 9x2+25y2+15xy+12x-20y+16 by 3x-5y-4 using suitable identity urgent

Answer 1

Hi ,

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We know the algebraic identity,

( a + b + c )(a² + b² + c² -ab - bc - ca )

= a³ + b³ + c³ + 3abc

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Now ,

(3x-5y-4)[9x²+25y²+16+15xy+12x-20y]

=[3x+(-5y)+(-4)][(3x)²+(-5y)²+(-4)²-3x(-5y)-(-5y)(-4)-(-4)3x]

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

= 27x³ - 125y³ - 64 - 180xy

I hope this helps you.

: )

Answer 2

Hi,


Please see the attached file!

Thanks