SOLUTION: hi i would like to know what are all the real zeros of f(x)=x^4-2x^3-23x^2+24x+144? and can u please show me hot to work it out

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: hi i would like to know what are all the real zeros of f(x)=x^4-2x^3-23x^2+24x+144? and can u please show me hot to work it out       Log On


   

Question 248424: hi i would like to know what are all the real zeros of f(x)=x^4-2x^3-23x^2+24x+144? and can u please show me hot to work it out
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
I graphed it. The zeroes are -3, -3, 4, 4
x^4-2x^3-23x^2+24x+144 = (x+3)^2*(x-4)^2