math hw

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2. If a^2-b^2=20 and a+b=2, what is the value of a-b?

I added the a^2-b^2+20 and a+b+20, but i couldn't get the answer to equal a-b.

  • math hw -

    Hey (a^2-b^2)= (a+b)(a-b) remember
    (a+b)(a-b) = 20
    2(a-b) = 20
    a - b = 10

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