Question

cu pule Ul the almirah. .
9. If x2 + y2 = 7 and xy = -7, find the value of (x + y)2.
SECTION-C
3X3=9
10. The cost of an article was Rs.22,000 . Rs 2400 were spent on its repairs. If
it is sold a profit of 12% , find the selling price of the article.
11. Simplify (a+b) (2a-3b+c) - (20-3b)c.
12. Show that (4pq +39)2 - (4pq – 39)2 = 48pq2.
OR
Find the following using suitable identities.
a. (6x2 – 5y)?
b. (7a - 9b) (7a + 9b)
C. (4x + 5) (4x + 1)​

Answer 1

Answer:

27128 rs

Step-by-step explanation:

10. the total cost of article is now (22000+2400)=24400rs

the celling price= (24400×112)÷100=27128rs