Question 5(b) Add : 2x (z - x - y ) and 2y (z - y - x)
2x(z−x−y)+2y(z−y−x)=2xz−2x2−2xy+2yz−2y2−2xy =2xz−2xy−2xy+2yz−2x2−2y2 =−2x2−2y2−4xy+2yz+2zx
(a)Add: p(p−q),q(q−r) and r(r−p)
(b)Add: 2x(z−x−y) and 2y(z−y−x)
(c)Subtract: 3l(l−4m+5n) from 4l(10n−3m+2l)
(d)Subtract: 3a(a+b+c)−2b(a−b+c) from 4c(−a+b+c)