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How do you factor #49 - 4x^2#?

1 Answer

May 12, 2015

This expression can be written as #7^2 - (2x)^2#

We know the difference of squares identity:

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

Hence #7^2 - (2x)^2 = color(green)((7+2x)(7-2x)#

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