How do you factor #9x^3-36x#?
1 Answer
Mar 27, 2018
Explanation:
#"take out a "color(blue)"common factor "9x#
#=9x(x^2-4)#
#x^2-4larr"is a "color(blue)"difference of squares"#
#•color(white)(x)a^2-b^2=(a-b)(a+b)#
#rArrx^2-4=(x-2)(x+2)#
#rArr9x^3-36x=9x(x-2)(x+2)#
