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I have posted a link there to this topic so the OP may see my work.Calculus tangent line?

If the line 3x-4y=0 is tangent in the first quadrant to the curve y=x^3+k then k is

(a)1/2

(b)1/4

(c)0

(d)-1/8

(e)-1/2

Could you please show work because I am so lost