Grove HSC 3U EX 10.4 - Q3, 9, 11c, 15, 16, 18a, 20ac, 21abe -: Binomial Theorem

QUESTIONS: Q3, 9, 11c, 15, 16, 18a, 20ac, 21abe,  

Q3 =====================

Fanks Tatiana :-)

Q9 =====================

Thx Becster :-)

Q11c =====================

Q15 =====================

Q16 =====================

Q18a =====================

Thanks Juliette :-)

Q20a =====================


Q20c =====================
This is a second version of this solution.

Thanks Tat & Ellie

Q20c - version 2-=====================

Q21a=====================

Q21b =====================

Q21e =====================