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10 September, 09:11

Which statement is true about the difference 2√7-√28

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  1. 10 September, 10:01
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    It seems like there are answer choices but you forgot to post them. If you want to simplify then

    2*sqrt (7) - sqrt (28) = 2*sqrt (7) - sqrt (4*7)

    2*sqrt (7) - sqrt (28) = 2*sqrt (7) - sqrt (4) * sqrt (7)

    2*sqrt (7) - sqrt (28) = 2*sqrt (7) - 2*sqrt (7)

    2*sqrt (7) - sqrt (28) = (2-2) * sqrt (7)

    2*sqrt (7) - sqrt (28) = (0) * sqrt (7)

    2*sqrt (7) - sqrt (28) = 0

    So the whole complicated expression simplifies to 0 (zero)

    This is because sqrt (28) = 2*sqrt (7) when you simplify sqrt (28)

    Side Note: "sqrt" is shorthand for "square root"
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