How do you factor completely #4x² - 36#?
1 Answer
Aug 28, 2016
Explanation:
The difference of squares identity can be written:
#a^2-b^2=(a-b)(a+b)#
So we find:
#4x^2-36#
#=4(x^2-9)#
#=4(x^2-3^2)#
#=4(x-3)(x+3)#
