Question

Help me in question 3rd and 4th.

plzz

answer it correct.​

Answer 1

Answer:

I can tell you the method and then you can do other sums in that method

3 a)

$(81a {}^{2} - 4) \div (9a - 2) =( (9a) {}^{2} - (2) {}^{2} ) \div (9a - 2) = (9a + 2)(9a - 2) \div (9a - 2) = 9a + 2$