The cost of a car, purchased 2 years ago, depreciates at the rate of 20% every year.If its present value is ₹ 2,52,480, find:

(i) its purchase price.

(ii) its value after 1 year.

If x² + y² = 37 and xy = 6; find :

(i) x + y

(ii) x - y

(iii) x² - y²

Expand : (2x - y + 2)³

Expand :

(i) (x - 2y + 6)(x - 2y - 6).

(ii) (2a - 4b + 7) (2a + 4b + 7).