[不明]請教一題很基本的題型...
題目為: Let y = mx + b be the equation for the line tangent to the graph of
the equation x^2y^2=16 at the point (2,2). Then m+b=?
剛看感覺滿簡單的,就直接代公式 y-f(a) = f'(a)(x-a)
可是這樣算出來答案會有兩組,而且越算到後面越詭異...
可否請各位前輩們指點呢?!
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感覺好基本的題型@@ 不過真的算得很毛@@
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