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college algebra

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Perform the indicated operation(s) and express the result in standard form. Leave answers in terms of square roots (do not use decimals).
(-9-sqrt-3)^2

  • college algebra -

    [-9 -sqrt(-3)]^2

    let me change that to i notation (i=sqrt-1)

    [-9- i sqrt3]^2
    Using FOIL
    81+9isqsrt3 +9isqrt3+i^2*3
    81+18i*sqrt3 -3
    78+18i*sqrt3

    remember i^2=-1

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