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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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