Question

14(3y-5z)³-7(5²-3y²) factories class 8 ​

Answer 1

Answer:

14(3y-5z)³-7(5²-3y²).

14((3y)³-(5z))³-3(3y)(5z)(3y-5z))-7((5+3y)(5-3y)). (Because (a-b)³=a³-b³-3ab(a-b) where a=3y & b=5z & a²-b²=(a+b)(a-b) where a=5 & b=3y).

14(27y³-125z³-135y²z-225yz²)-7((5+3y)(5-3y)).

378y³-1750z³-1890y²z-3150yz²-35-21y-35+21y. Because -×+=- & -×-=+).

378y³-1750z³-1890y²z-1350yz²-35-35.

378y³-1750z³-1890y²z-1350yz²-70.

I think this is your answer.