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How do you factor #16-4a^2 #?

1 Answer

May 17, 2015

property :
#color(blue)(a^2 - b^2 = (a+b)(a-b)#

expression given is:
# 16 - 4a^2#
# = 4^2 - (2a)^2#
here , #a = 4 and b = 2a#

rewriting the expression:
# 4^2 - (2a)^2 = (4+2a)(4-2a)# , this is the factorised form.

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