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Asked Sep 5, 2019
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72 please 

disprove that H is a subgroup of GL(2, R).
72. Let H {a + bi | a, b E R, ab 0}. Prove or disprove that H is a
subgroup of C under addition.
73. Let H= {a + bi a, b E R, a2 b= 1}. Prove or disprove that
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disprove that H is a subgroup of GL(2, R). 72. Let H {a + bi | a, b E R, ab 0}. Prove or disprove that H is a subgroup of C under addition. 73. Let H= {a + bi a, b E R, a2 b= 1}. Prove or disprove that

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Let x 0+2i, here a = 0,b 2 ab(0) (2) ab 0 xeH Let y -3+0i, here a = -3,b 0 ab (-3) (0) ab 0 yH

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Advanced Math