Question

The differential equation of all confocal conics (conic with same focus) *2 + t = 1(2+ -1, - 2) is (A) yy, = xyz + xyy, (B) (y - xy)2 = (1+y) (C) yyz + y + x = 0 (D) (x + yy.)(xy, - y) = y,​

Answer 1

Answer:

Basic Algebra Identities

(a + b)2 = a2 + b2 + 2ab

(a – b)2 = a2 + b2 – 2ab

a2 – b2 = (a + b)(a – b)

a2 + b2 = (a + b)2 – 2ab = (a – b)2 + 2ab

a3 + b3 = (a + b)(a2 – ab + b2)

a3 – b3 = (a – b)(a2 + ab + b2)

(a + b)3 = a3 + 3ab(a + b) + b3

(a – b)3 = a3 – 3ab(a – b) – b3