How do you simplify and find the excluded value of #(x^2+x+1)/(1-x^2)#?
1 Answer
Apr 26, 2017
see explanation.
Explanation:
Factorise the denominator using the
#color(blue)"difference of squares"#
#(x^2+x+1)/((1-x)(1+x))# The denominator of the function cannot equal zero as this would make it
#color(blue)"undefined".# Equating the denominator to zero and solving gives the values that x cannot be.
#"solve " (1-x)(1+x)=0#
#rArrx=1" or " x=-1larrcolor(red)" excluded values"#
