The problem
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I don't understand how the -2 turned to -5
Answer provided by our tutors
"-2(p + 1)" has been split into "-5(p + 1) + 3(p + 1)"
You can do this because "-2 = -5 + 3" so
-2(p + 1) = (-5 + 3)(p + 1) = (-5)(p + 1) + 3(p + 1)