Question

for factorising 49a2+70ab+25b2 which of these identity is helpful . ( )
a)(x+y) (x-y) = x2-y2 b) (x+y)2=x2+2xy+y2 c) (x-y)2=x2-2xy+y2 d) (x+y+z)= x2+y2+z2+2xy+2yz+2zy​

Answer 1

Answer:

x+y) (x-y) = x2-y2 b) (x+y)2=x2+2xy+y2 c) (x-y)2=x2-2xy+y2 d) (x+y+z)= x2+y2+z2+2xy+2yz+2zyf 278