Question

60. 9(2a - b) 2 – 4(2a – b) – 13​

Answer 1

Answer:

=36a-18-8a-4b-13

=28a-4b-31

Step-by-step explanation:

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Answer 2

(9×2a-9×b)2 -4×2a+4×b -13

(18a-9b)2-8a+4b-13

18a×2-9b×2-8a+4b-13

36a-18b-8a+4b-13

36a-8a-18b+4b-13

28a-14b-13