JOSHUA B.

asked • 02/04/18

f(x)=3x3+1/4x−7 Let x=4/'5.

 so i am struggling in math because of this and parabolas with a 36 average i desperately need help before i fail

Bobosharif S.

If you formulate your question accurately, still you have chance to succeed. Actually, what is your question?
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02/04/18

1 Expert Answer

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Carol H. answered • 02/04/18

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f(x) = 3x3 + (1/4)x - 7
f(4/5) = 3(4/5)3 + (1/4)(4/5) - 7
f(4/5) = 3(64/125) + 1/5 - 7
f(4/5) = 192/125 - 34/5
f(4/5) = 192/125 - 850/125
f(4/5) = -658/125
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Kenneth S.

What makes you so certain that f is a cubic, Carol? 
 
I think you should have asked if the student intended for it to be a rational algebraic function (and as is so frequently the case, omitted needed parentheses).
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02/04/18

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