cubic function -b-√b2-3ac/3a - 1 < x < -b-√b2-3ac/3a + 1 ， -b+√b2-3ac/3a - 1 < x < -b+√b2-3ac/3a + 1 Δx > Δy T.theodor 2022.7.6

cubic function a > 0 ，a( -b+√b2-3ac/3a )3 + b( -b+√b2-3ac/3a )2 + c( -b+√b2-3ac/3a ) + d > 0 ，a( -b-√b2-3ac/3a )3 + b( -b-√b2-3ac/3a )2 + c( -b-√b2-3ac/3a ) + d < 0 ， a < 0 ，a( -b+√b2-3ac/3a )3 + b( -b+√b2-3ac/3a )2 + c( -b+√b2-3ac/3a …

Cubic function ( -b-√b2-3ac/3a ，a( -b-√b2-3ac/3a )3 + b( -b-√b2-3ac/3a )2 + c( -b-√b2-3ac/3a ) + d ) ，( -b+√b2-3ac/3a ，a( -b+√b2-3ac/3a )3 + b( -b+√b2-3ac/3a )2 + c( -b+√b2-3ac/3a ) + d ) T.theodor 2022.7.6