Are you sure it's minus 49?
If so, then:
9a2 +42a -49
={(3a)2 + 2·3a·7 + 72} -2·72
=(3a -7)2 - (7·sqrt(2))2 (2nd binomial formula)
={(3a -7) + (7·sqrt(2))} · {(3a -7) - (7·sqrt(2))} (3rd binomial formula)
=(3a +2,89949) · (3a -16,89949).
Otherwise if it's plus 49 then simpler:
9a2 +42a +49
={(3a)2 + 2·3a·7 + 72}
=(3a -7)2.
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The GCF is a.
9a4-b2=36a-2b=2(18-b) But if you meant 9a^4-b^2 it is not possible to factor
it sometimes decreases because as the virus infects a beacterial cell its dormant as it infects it. it then spreads to other cells adn becomes active again. 9A. do you own work
They are 1, 2, 3, 4, 6, 9, 12, 18, 36,1a, 2a, 3a, 4a, 6a, 9a, 12a, 18a, 36a,1b, 2b, 3b, 4b, 6b, 9b, 12b, 18b, 36b,1a2, 2a2, 3a2, 4a2, 6a2, 9a2, 12a2, 18a2, 36a2,1ab, 2ab, 3ab, 4ab, 6ab, 9ab, 12ab, 18ab, 36ab,1b2, 2b2, 3b2, 4b2, 6b2, 9b2, 12b2, 18b2, 36b2.
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