Question

find the product (3x-5y-4) (9x²+25y²+15xy+12x-20y+16)​

Answer 1

Answer:

answer is in the photo....

Answer 2

Answer:

Putting the value of 3x=a, (-5y)=b and (-4)=c

(3x-5y-4) (9x²+25y²+15xy+12x-20y+16)

=(3x-5y-4) (9x²+25y²+16+15xy-20y+12x)

={(3x)+(-5y)+(-4)}{(3x)²+(-5y)²+(-4)²-(3x)-(-5y)-(-5y)(-4)-(-4)(3x)

=(a+b+c)(a²+b²+c²+ab-bc+ca)

=a³+b³+c³-3abc

=(3a)²m³+(-5y)³+(-4)³-3×(3x)(-5y)(-4)

=27x³-125y³-64-180xy

Step-by-step explanation:

Hope this helps you.