Question

PLEASE DO QUESTION NO. 31

Answer 1

12ky²+8ky-20k
take 4k common
4k(3y²+2y-5)
4k(3y²-3y+5y-5)
4k[3y(y-1)+5(y-1)]
4k(y-1)(3y+5)
dimensions are length =4k
breadth = (y-1)
height=(3y+5)
hope this helps

Answer 2

(a-b)^3

= 8a^3=(2a)^3
= b^3= (b)^3

So, (2a-b)^3 is the factor