math
posted by MARIAH on .
I HAVE TWO QUESTIONS: I HAVE TO MULTIPLY AND SIMPLIFY AND I HAVE NO CLUE HERE ARE THE PROBLEMS:
1. 7a21a^2/9a^2+6a+1 x 9a^2+6a+1/9a^21
2. 2a+2/8a+24 x 4x+12/2x^22

You have to use brackets.
I think you mean ...
(7a21a^2)/(9a^2+6a+1) (9a^2+6a+1)/(9a^21)
= 7a(1  3a)/(9a^2+6a+1) (9a^2+6a+1)/((3a1)(3a+1))
= 7a/(3a+1)
the second one factors nicely too once you put the brackets in