Math - Find Δy and f'(x)Δx?

Find Δy and f(x)Δxy=f(x)=6/x^4x= -1.6Δx=0.1(Round to four decimal places at final answer) or:Find \u0394y and f'(x)\u0394xy=f(x)=6/x

Find Δy and f'(x)Δx
y=f(x)=6/x^4
x= -1.6
Δx=0.1
(Round to four decimal places at final answer)

or:Find \u0394y and f'(x)\u0394xy=f(x)=6/x^4x= -1.6\u0394x=0.1(Round to four decimal places at final answer)

or:Math homework I suppose? I don't know. You have to solve it out yourself you little dude. Is it the \u221a\u0394f(x)=6/x^4? Wait, WHAT? I can't solve this. Solve it out yourself or give yourself some time to look it up on Google/Yahoo/Wikipedia

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