Chapter 2: Introduction to Linear Polynomials
Chapter 2: Introduction to Linear Polynomials
Exercise
Question
Question: 4 (ii)
11 / 12
11 / 12
A telecom company charges ₹600 for a certain recharge scheme. This prepaid balance is reduced by ₹15 each day after the recharge.
(ii) After how many days will the balance run out?
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Answer
1
Recall the expression derived in the previous question for the balance b(x) and time x.
$b(x) = 600 - 15x$
2
Find when the balance runs out by setting it equal to 0.
\text{${color:#2E2EFF}0{/color} = 600 - 15x$}
⇒
$15x = 600$
⇒
\text{ $x = \dfrac{600}{15}$}
⇒
$x = 40$
3
Write when the balance will run out.
Answer: The balance will run out after 40 days.