1. Show that (a + b)2 = a2 + 2ab + b2

  2. Show that a2 - b2 = (a + b) (a - b)

  3. Show that (a + b)2 + (a - b)2 = 2(a2 + b2)

  4. Show that (a + b)3 = a3 + 3a2b + 3ab2 + b3

  5. Show that a3 + b3 = (a + b) (a2 - ab + b2)

  1. Solve a quadratic equation 4x2+8x-5=0

  2. Show that a + b ³ 2 Öab

  3. Show that x + 1/x ³ 2

  4. Show that a/b < (a+c)/(b+d) < c/d
    (a,b,c,d>0)




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