19. If a and ß are the roots of 4x^2 + 3x + 7 = 0, then the value of 1/a+1/b is
(a) -3/4
(b)-3/7
(c) 377
(d) 714
7/4
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Answer:
a+b=-3/4, ab=7/4
(a+b)/ab=(3/4)/(7/4)=3/7
a/ab+b/ab=3/7
1/a+1/b=3/7
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