math

42. Hosni gave the following argument that 2(a 1 b) 5
2a 1 2b, for all integers a and b. If the argument is
correct, supply the missing reasons. If it is incorrect,
explain why not.

-a (b+a)= (-1)(a+b)
= (-1)a+ (-1) b
= a+ -b

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asked by keyera

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