Identify like terms in the following:
(a)–xy2,–4yx2,8x2,2xy2,7y,–11x2,–100x,–11yx, 20x2y,–6x2,y,2xy,3x
(b) 10pq,7p,8q,–p2q2,–7qp,–100q,–23,12q2p2,–5p2,41,2405p,78qp,13p2q,qp2,701p2
(a) Like terms are: (i) -xy2,2xy2 (ii) -4yx2,20x2y (iii) 8x2,-11x2,-6x2 (iv) 7y, y (v) -100x, 3x (vi) -11yx, 2xy
(b) Like terms are: (i) 10pq,-7pq,78pq (ii) 7p,2405 p (iii) 8q,-100q (iv) -p2q2,12p2q2 (v)-12,41 (vi) -5p2,701p2 (vii)13p2q,qp2
Match the items given in Column I with one or more items of Column II.
Column I | Column II |
(a) A plane mirror | (i) Used as a magnifying glass. |
(b) A convex mirror | (ii) Can form image of objects spread over a large area. |
(c) A convex lens | (iii) Used by dentists to see enlarged image of teeth. |
(d) A concave mirror | (iv) The image is always inverted and magnified. |
(e) A concave lens | (v) The image is erect and of the same size as the object. |
- | (vi) The image is erect and smaller in size than the object. |