Question

The number of books brought for $40 is 40/x. The cost of each book is increased by $2. The number of books bought for $40 is now one less than before. Write down an equation in x and show that it simplifies to x square +2x-80=0

Answer 1

Answer:

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Answer 2

Answer:

Exercise

1--In the given situation ,does the list of numbers involved make an A.P.,and why?

The cost of digging a well after every metre of digging ,when it's cost Rs 150 for the first metre and rises by Rs 50 for each subsequent metre.

2--Write first four terms of the A.P. , when the first term a and the common difference d are given as follows:

(a) a=10 , d=10

(b)a=-2 ,. d=0

(c)a=4 ,. d=-2

(d)a=-1,. d=1/2

(e)a=1.25, d=-0.25

The number of books brought for $40 is 40/x. The cost of each book is increased by $2. The number of books bought for $40 is now one less than before. Write down an equation in x and show that it simplifies to x square +2x-80=0