0
Anonymous
5929
How you get it is to first multiply 77 with 7 and get 539. Then multiply 77 by 70 by multiplying by 7 again as before, but adding a 0 on the end. That gives 5390. Then add 539 to 5390 and get 5929.
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2 x 77 = 154
1 x 77, 7 x 11
x² - 4x - 77 = (x + 7)(x - 11)
77
1 x 77, 7 x 11.