# alg 2 check?

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(4x+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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