Solve the polynomial inequality graphically.−x^3−3x^2−9x+4<0

ringearV

ringearV

Answered question

2021-05-19

Solve the polynomial inequality graphically.
x33x29x+4<0

Answer & Explanation

tafzijdeq

tafzijdeq

Skilled2021-05-20Added 92 answers

Input the equation into your calculator and graph it: x33x29x+4
Use the Zero function on your calculator to find the zero is 0.387827
Cubic functions have 3 zeros. This one has only one rational zero.
3 The function (y) is less than zero when x is greater than 0.388. The interval is going to be open since the function is less than zero at x values that are less than 0.388, but not at 0.388.
Look for areas in the graph where the function is below the x axis.

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