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22 August, 11:26

What's the value of the product (3-2i) (3+2i)

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  1. 22 August, 11:52
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    (3 - 2i) (3 + 2i). Its form is (a - b) (a + b) = a² - b²

    (a = 3 and b = 2i)

    (3) ² - (2i) ²

    = 9 - (4i²), but 1² = - 1

    = 9 - (-4) = 9+4 = 13

    So (3-2i) (3+2i) = 13
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