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Lv 4
? asked in Science & MathematicsMathematics · 6 years ago

Can someone help me with solving this inequality?

I'm having some trouble solving this inequality: x^3+5> 5x^2+x if you guys could show me how you do this I would appreciate it very much.

1 Answer

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  • Julius N
    Lv 7
    6 years ago

    easiest way, solve:

    (x^3+5) - (5x^2+x) > 0

    solution set:

    { -1 < x < 1} or { x > 5 }

    note that:

    x= -1

    (x^3+5)= 4

    (5x^2+x)= 4

    x= 1

    (x^3+5)= 6

    (5x^2+x)= 6

    x= 5

    (x^3+5)= 130

    (5x^2+x)= 130

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