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January 26, 2015

January 26, 2015

Posted by **Zac** on Saturday, May 5, 2012 at 8:53pm.

f(x)=4x^5+4x^2-9

Find all rational roots of each function

f(x)=2x^3+x^2+8x+4

- algebra 2 -
**bobpursley**, Saturday, May 5, 2012 at 9:01pmsecond:

x^2(2x+1)+4(2x+1)

(2x+1)(x^2+4)

(2x+1)(x+j)(x-j)

so if the expression were equal zero, then

zeroes are -1/2, -j,+j where j= sqrt(-1)

so the only rational root is -1/2

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