Question

8mn ,4mn is a like term
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Answer 1

21b–32+7b–20b

Answer: 21b–32+7b–20b

=21b+7b–20b–32

=28b–20b–32=8b–32

(b) –z2+13z2–5z+7z3–15z

Answer: -z2+13z2–5z+7z3–15z

=-z2+13z2–5z–15z+7z3

=12z2–20z+7z3

(c) p–(p–q)–q–(q–p)

Answer: p–(p–q)–q–(q–p)

=p–p+q–q–q+p

=p–p+p+q–q–q

=p–q

(d) 3a–2b–ab–(a–b+ab)+3ab+b–a

Answer: 3a–2b–ab–a+b–ab+3ab+b–a

=3a–a–a–2b+b+b–ab–ab+3ab

=3a–2a–2b+2b–2ab+3ab

=a+ab

Answer 2

Answer:

Yes !

8mn and 4mn is a like term.

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