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If A is a square matrix …

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If A is a square matrix such that A²=I, then find the simplified value of (A - I)³ + (A+I)³ -7A .

    • Posted by Nisha Devi 5 years, 8 months ago

    CBSE > Class 12 > Mathematics
    • 1 answers

    Chirag Sharma 5 years, 8 months ago

    =A³+I³-3A²I+3AI²+A³+I³+3A²I+3AI²-7A as A³=A²A=A =A+I+3A+A+I+3A-7A =A+2I

    2Thank You

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