Question

*The price of one box is (a - 7) Rs. What is the total cost of (a + 7) boxes?*

1️⃣ ₹(a² - 14a + 49)
2️⃣ ₹(a² - 49)
3️⃣ ₹(a² + 14a + 49)
4️⃣ ₹(a² + 49)​

Answer 1

Answer:

4) ₹(a² + 49) is the answer

Step-by-step explanation:

Given :- The price of one box is (a - 7) Rs. What is the total cost of (a + 7) boxes ?

1) ₹(a² - 14a + 49)

2) ₹(a² - 49)

3) ₹(a² + 14a + 49)

4) ₹(a² + 49)

Solution :-

we have,

→ Price of 1 box = ₹ (a - 7)

and,

→ Total number of boxes = (a + 7)

then,

→ Price of all boxes = Price of 1 box * Total number of boxes

→ Price of all boxes = (a - 7) * (a + 7)

using :-

(x - y)(x + y) = x² - y²

→ Price of all boxes = (a)² - (7)²

→ Price of all boxes = ₹(a² - 49) (Ans.2)