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alg 2 check?

posted by on .

(4x+y)^2


answer:16x^2+y^2
is this correct?

  • alg 2 check? - ,

    not quite

    (4x+y)(4x+y) = 16x^2 + 4xy + 4xy + y^2
    = 16x^2 + 8xy + y^2

    You can always check your results by evaluating with numbers. For example, if x=1 and y=2,

    (4+2)^2 = 36
    16*4+1 = 65
    a good sign your result is wrong

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