Question

factorise the following using suitable identities 81× 2 - 1100y2​

Answer 1

Answer:

(81)

2

= (80+1)

2

= (80)

2

+2×80×1+(1)

2

[Using, (a+b)

2

=a

2

+2ab+b

2

]

= 6400+160+1

= 6561

Answer 2

81 x 2 - 1100y2

factor out 2

2 ( 81 - 550y2 )