No, it equals -2xy. lrn2math
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Yes.
Need signs between terms.
(-3, -5)
If the line y = 2x+1.25 is a tangent to the curve y^2 = 10x then it works out that when x = 5/8 then y = 5/2
If you mean: (2x-7y)(x+y) then it is 2x squared -5xy -7y squared