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OpenStudy (anonymous):
help please Solve this!!!
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OpenStudy (anonymous):
OpenStudy (alekos):
comes down to x^3+27x^2-9x-7 <= 0 need to solve the cubic equation from here, i'll show you how
OpenStudy (alekos):
this can't be solved by hand so we need to use a cubic equation calculator
OpenStudy (alekos):
how did you arrive at this?
OpenStudy (anonymous):
you have started the question with the right approach... next factorise the equation in the bracket to a simpler form using the quadratic formula then you will have an inequality of the form x(x-a)(x-b) <7 then you can sketch a rough graph using the x intercepts to find range of x
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