Question

81x^2-25

Answer 1

Hint: a^2-b^2=(a+b)(a-b)

Answer 2

Difference of squares, baby!

Answer 3

Write this thing as:\[ (9x)^2 - (5)^2\]and then see what allank said.

Answer 4

has he asked about factorizing ....he might be asking to differentiate ..without seeing what he has asked for you guys solved it..

Answer 5

Of course, this difference of squares formula would help him with differentiation too.

Answer 6

no doubt..but why to use this formula ..when it can be calculated directly by differentiating ...secondly, i used differentiation just as an example..the above equation can be used in other places too...i just wanted to say let him ask what is to be solved...thank you

Answer 7

Use mathway.com.... type in your question. Gives you the answer