Question

MODEL
On expansion of (a + b + c)² and its corollaries
11. Expand the squares of the following trinomials.
(a) a + 2b + 30 (b) 2x + 3y + 4z (c) x + 2y - 32
1
(d) 3a - 4b-c (e)1-x+ - (f) 1-a-a?
х​

Answer 1

Answer:

(a+b+c)²= a²+b²+c²+2(ab+ bc+ ca)

1. a²+4b²+900+4ab+120b+60a