Algebra II

I need help in multiplying two square roots. (5*sqrt7-10*sqrt2)(4*sqrt7+8*sqrt2)=

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  1. You will be multiplying four pairs of square roots, not two.

    Remember that (a + b)*(c + d)
    = ac + ad + bc + bd

    Now do the multiplying.
    You will end up with two terms, 40 sqrt14 and -40 sqrt14 that cancel. The other two terms will not cancel, but you can get rid of the square roots

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