Question

19. Find the prvu
Simplify each of the following:
20. a (b - c) + b(c - a) + c(a - b)
21. a (b - c) - b(c - a)- c(a - b)
22. 3x2 + 2(x + 2) – 3x (2x +1)
23. x(x + 4) + 3x (2x2 - 1) + 4x2 + 4
24. 2x2 + 3x (1 – 2x 3 ) + x (x +1)
25. aềbla – b2) + ab?(4ab - 2a?) - ab (1 - 2b)
26. 4st (s – t) – 6sº(t – t2) - 3+2 (2s2 – s)+2st (s -t)
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Answer 1

20.= ab-ac+bc-ba+ca-cb

= ab-ba+ca-ac+bc-cb

=0

21=