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Use Descartes' Rule of Signs and the Rational Zeros Theorem f(x)=5x32x2+25x10f ( x ) = 5 x ^ { 3 } - 2 x ^ { 2 } + 25 x - 10

Question 125

Multiple Choice

Use Descartes' Rule of Signs and the Rational Zeros Theorem to find all the real zeros of the polynomial function. Use the
zeros to factor f over the real numbers.
- f(x) =5x32x2+25x10f ( x ) = 5 x ^ { 3 } - 2 x ^ { 2 } + 25 x - 10


A) 5,1,25;f(x) =(5x2) (x+1) (x+5) - 5 , - 1 , \frac { 2 } { 5 } ; f ( x ) = ( 5 x - 2 ) ( x + 1 ) ( x + 5 )
B) 25;f(x) =(5x2) (x2+5) \frac { 2 } { 5 } ; f ( x ) = ( 5 x - 2 ) \left( x ^ { 2 } + 5 \right)
C) 10;f(x) =(x10) (5x2+1) 10 ; f ( x ) = ( x - 10 ) \left( 5 x ^ { 2 } + 1 \right)
D) 5,25,1;f(x) =(5x2) (x1) (x5) 5 , \frac { 2 } { 5 } , 1 ; f ( x ) = ( 5 x - 2 ) ( x - 1 ) ( x - 5 )

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