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28 November, 20:59

Expand and simplify (4 + √7) (2 - √7).

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Answers (1)
  1. 29 November, 00:55
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    1 - 2√7

    Step-by-step explanation:

    (4 + √7) (2 - √7)

    Open the brackets with

    (4 + √7)

    = 4 (2 - √7) + √7 (2 - √7)

    = 8 - 4√7 + 2√7 - √49

    = 8 (-4 + 2) √7 - √49

    = 8 - 2√7 - 7

    = 8 - 7 - 2√7

    = 1 - 2√7
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