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Chapter 7 Solution of Equations
Algebraic Equations

Solve the following equations:

                                                                            7 3 5
    1. a) x 5        7x 4       x3       x2    7x 1 0           Ans. 1,
                                                                              2
                                                                        3       13 1       5
        b) x 4       4x 3       x2        4x 1 0                Ans.              ,
                                                                        2              2
        c) ( x 1)(x            2)(x 3)(x 4)        24           Ans. 0, 5
                                                                               1 1
        d) 36x 4          13x 2          1 0                     Ans.           ,
                                                                               2 3
          x2              y2         9
    2. a)
          y               x          2                   Ans. (2,1), (1,2)
                     3
                                1
                 x        y
              3 x 2 5 xy 2 y 2 0                                           9     217 3(9   217)
        b)                                               Ans. (2, 4), (             ,           )
           x 2 2 y 2 6x 4 y 8 0                                                 17       17
                      4
             x          1
                      y                                         4           1
        c)                                               Ans. ( ,20), ( ,5)
                     4                                          5           5
             y          25
                     x
             x       y        2 xy
                                                                            1      1
        d)   y z              3 yz                        Ans. (0,0,0), ( , 1, )
                                                                            3      4
             z x              7 zx
           4 x 3 3x 2 y y 3 8                                               1 3 1 3 1 3 1
        e)                                                Ans. (1,1), (3      ,3 ) , (    ,4    )
           2 x 3 2 x 2 y xy 2 1                                             5    5     10    10
           3x 2 5 y 2                7
        f)                                                Ans. (2,1), ( 2, 1), (3,2), ( 3, 2)
           3xy 4 y 2                 2
             xy       x        y 1 6
        g) yz         y        z 1 12                      Ans. (1,2,3), ( 3, 4, 5)
             zx       z        x 1 8
Trigonometric Equations

Find the general solutions (express in radian) of following equations

                                                               2n
    1.    2 cos( 3 x       ) 1 0                         Ans.                                  n
                       6                                        3        12       18
             3x                                                4n                         2
    2.   2 sin  1 0                                       Ans.           ( 1) n       1
                                                                                                   n
              4                                                 3                          9
            x
    3. tan(     )   3                                     Ans. 4n        n
            4 3

    4.   sin x 1 cos x                                    Ans. n        ( 1) n                     n
                                                                                  4        4

    5.    3 sin x cos x       3                           Ans. n         ( 1) n                    n
                                                                                  3            6

    6.   ( 3 1) cos x ( 3 1) sin x        2                Ans. 2n                             n
                                                                          4       12

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Chapter 7 solution of equations

  • 1. Chapter 7 Solution of Equations Algebraic Equations Solve the following equations: 7 3 5 1. a) x 5 7x 4 x3 x2 7x 1 0 Ans. 1, 2 3 13 1 5 b) x 4 4x 3 x2 4x 1 0 Ans. , 2 2 c) ( x 1)(x 2)(x 3)(x 4) 24 Ans. 0, 5 1 1 d) 36x 4 13x 2 1 0 Ans. , 2 3 x2 y2 9 2. a) y x 2 Ans. (2,1), (1,2) 3 1 x y 3 x 2 5 xy 2 y 2 0 9 217 3(9 217) b) Ans. (2, 4), ( , ) x 2 2 y 2 6x 4 y 8 0 17 17 4 x 1 y 4 1 c) Ans. ( ,20), ( ,5) 4 5 5 y 25 x x y 2 xy 1 1 d) y z 3 yz Ans. (0,0,0), ( , 1, ) 3 4 z x 7 zx 4 x 3 3x 2 y y 3 8 1 3 1 3 1 3 1 e) Ans. (1,1), (3 ,3 ) , ( ,4 ) 2 x 3 2 x 2 y xy 2 1 5 5 10 10 3x 2 5 y 2 7 f) Ans. (2,1), ( 2, 1), (3,2), ( 3, 2) 3xy 4 y 2 2 xy x y 1 6 g) yz y z 1 12 Ans. (1,2,3), ( 3, 4, 5) zx z x 1 8
  • 2. Trigonometric Equations Find the general solutions (express in radian) of following equations 2n 1. 2 cos( 3 x ) 1 0 Ans. n 6 3 12 18 3x 4n 2 2. 2 sin 1 0 Ans. ( 1) n 1 n 4 3 9 x 3. tan( ) 3 Ans. 4n n 4 3 4. sin x 1 cos x Ans. n ( 1) n n 4 4 5. 3 sin x cos x 3 Ans. n ( 1) n n 3 6 6. ( 3 1) cos x ( 3 1) sin x 2 Ans. 2n n 4 12