Let the first number be x and the second number is 27 − x.
Therefore, their product = x (27 − x)
It is given that the product of these numbers is 182.
Therefore, x(27-x) = 182
⇒ \(x^2 -27x +182 = 0\)
⇒ \(x^2 - 13x -14x +182 =0\)
⇒ \(x(x-13) -14 (x-13) =0\)
⇒ \((x-13)(x-14) = 0\)
x – 13 = 0 or x − 14 = 0
i.e., x = 13 or x = 14
If first number = 13,then
Other number = 27 − 13 = 14
If first number = 14, then
Other number = 27 − 14 = 13
Therefore, the numbers are 13 and 14.
Solve the problems given in Example 1:-
(i) John and Jivanti together have 45 marbles. Both of them lost 5 marbles each, and the product of the number of marbles they now have is 124. Find out how many marbles they had to start with.
(ii) A cottage industry produces a certain number of toys in a day. The cost of production of each toy (in rupees) was found to be 55 minus the number of toys produced in a day. On a particular day, the total cost of production was Rs 750. Find out the number of toys produced on that day.
Find the roots of the following quadratic equations by factorisation:
(i) \(x^2 – 3x – 10 = 0\)
(ii) \(2x^2 + x – 6 = 0\)
(iii) \(\sqrt2x^2+7x+5\sqrt2 = 0\)
(iv) \(2x^2 – x + \frac{1}8\)\( = 0\)
(v) \(100x^2 – 20x + 1 = 0\)
| Class | 0 – 15 | 15 – 30 | 30 – 45 | 45 – 60 | 60 – 75 | 75 – 90 |
|---|---|---|---|---|---|---|
| Frequency | 11 | 8 | 15 | 7 | 10 | 9 |
Leaves of the sensitive plant move very quickly in response to ‘touch’. How is this stimulus of touch communicated and explain how the movement takes place?
Read the following sources of loan carefully and choose the correct option related to formal sources of credit:
(i) Commercial Bank
(ii) Landlords
(iii) Government
(iv) Money Lende