ANSWER KEY X ICSE BATCH I II (17/04/10)

ANSWER KEY X ICSE BATCH I II (17/04/10)

X ICSE MATHEMATICS (80)
             SECTION A
Q.1) A     Rs.10,560; Rs.11,616; Rs.2016; Rs.1056,105.60
        B     Rs.8320
        C     Rs.1600
Q.2) A     x =  +1, -2/7
        B     x = (3+√3)/2; (3-√3)/2
        C            [-1/2  -2]
                       [ 1/2  -1]
Q.3) A     PROVE
        B     i) 13 ii) 4√m2+n2
        C     b = 8 ; a = 1
Q.4) A     p = 3 ; q = 10
        B     PROVE
        C     PROVE
Q.5) A     18%, Rs.11,139.20, Rs.2005.02,
        B     Rs.13,122
        C     3,11,040 ; 1,50,000
Q.6) A    Rs.35,370.50
        B     8%
        C     Rs.2,111.90
Q.7) A     x = 0, x = 3/2 ;  x = 20 or x = -25
        B     x = - 1 or 5/2 ; factors not possible.
        C     x =7 or 11
Q.8) A    a = -5, k = 8
        B    a = -3, b = -1
        C    (x-2)(x+1)(2x-7)
Q.9) A    [1  2]
               [3  5]
        B    x = 2, y = 4, z = 1, w = 3
        C    a = 2, b = 2 ;   M = [4  1]
                                               [1 -6]
Q.10 A     5,  2√a2+b2
         B     PROVE
         C     PROVE
Q.11 A     PROVE
         B     PROVE
         C     PROVE