Practice!

Sample Problem

Find all real values of x such that f(x)=0.

f(x)=x+x2-4x-4

Please order your answers from least to greatest (rounded to the nearest whole number).

x= , ,

 

Solution

f(x)=x+x2-4x-4

f(x)=x2(x+1)-4(x+1)

f(x)=(x+1)(x2-4)

f(x)=(x+1)(x-2)(x+2)

x= -2, -1, 2