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    1. (10 A + 9 B)(10 A - 9 B) = 100 A2 - 81 B2 False True False
    2. (-10 + A)(10 + A) = -100 + A2 False True False
    3. A2 = 0 ⇒ A = 0 True True False
    4. 10 AT + A is symmetric False True False

    how do i do these questions? i seriously dont get it someone please help me

    Read these properties of matrix operations
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