Question

simplify the following
(i) (x-2y)(y-3x)+(X+y)(x-3y)-(y-3x)(4x-5y)
(ii) (a-2b+5c)(a-b)-(a-b-c)(2a+3c)+(6a+b)(2c-3a-5b)
(iii) (pq-qr+pr)(pq+qr)-(pr+pq)(p+q-r)
please answer my question with step by step explanation​

Answer 1

Step-by-step explanation:

1. solution

=xy-3x^2-2y^2+3xy+x^2-3xy+xy-3y^2-4xy+5y^2+12x^2-15xy

=10x^2-18xy