a zero between the given values. 35. ( ) 6 f x x4 x3 = + −18x2 = f(2) –8 = 81 f(3) The sign change shows there is a zero between the given values. 36. ( f ) x = 2 x4 − 4 x2 +1 = –1 f(0) = 1
35. 36. f ( x ) = 2 x4 − 4 x2 +1 = –1 f(0) = 1 a zero between the given values. f ( x ) = x4 + 6 x3 −18x2 f(2) = –8 f(3) = 81 The sign change shows there is a zero between the given values.