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OpenStudy (anonymous):
Attach file need help ,Please! a) x^3 +4x^2 -21x = 0 positive x: f(x)= x^3 +4x^2 -21x = 0 ..............no.....yes....( 1 sign change , than how many ,imaginary and zero ? ) negative x f(-x)= -x^3 + 4x^2 +21x = 0 ................yes......no........( one change, how I know how many ,imaginary and zero ?)
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