Question

Q25. (A)simplify: (a+b) (2a-3b+c)-(2a-
3b)c (B)subtract: 3a(a+b+c)-2b(a-b+c)
from 4c(-a+b+c)​

Answer 1

Answer:

Step-by-step explanation:

(A)(a+b)(2a-3b+c)-(2a-3b)c

a(2a-3b+c) +b(2a-3b+c) -[ 2a(c) - 3b(c)]

2a2 - 3ab+ ac + 2ab - 3b2 +bc - 2ac + 3bc

=2a2 -ab -ac+4bc-3b2

(B)4c(-a+b+c) - [3a(a+b+c)-2b(a-b+c)]

=-4ac+4bc+4c²-[3a²+3ab+3ac-2ab+2b²-2bc]

=-4ac+4bc+4c²-3a²-3ab-3ac+2ab-2b²+2bc

=-4ac-3ac+4bc+2bc+4c²-3a²-2b²-3ab+2ab

=-7ac+6bc-ab+4c²-3a²-2b²

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