Question

If 18,a,b,-3 are in A.P,then a+b=

Answer 1

Answer:

a=18

b=-3

Step-by-step explanation:

A. Pa+b=18-3=15

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Answer 2

Answer:

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Step-by-step explanation:

Twice the middle term is sum of terms on either side.

2 a = 18 + b

2 b = a - 3

adding these two equations,  a +b=15

x + 1/x = 50/7

7 x^2 - 50 x + 7 = 0

(7x - 1)(x - 7) = 0        Number  is  x = 7 or  1/7

Y = 3  and    Y = - 3 x  will intersect at

  Y = 3 = - 3 x  =>  x = -1  ie., (-1, 3)

(x+y)/(xy)  = 1/y + 1/x