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How do you multiply #(7q - 5)(7q + 5)#?

1 Answer

Feb 26, 2016

#=49q^2 -25#

Explanation:

#(7q-5) (7q+5)#

The above expression is of the form:
#color(blue)((a-b)(a+b) = a^2-b^2#

Applying the above property:

#7q = color(blue)(a#
#5 = color(blue)(b#

#(7q-5) (7q+5) = (7q)^2 - 5^2#

#=49q^2 -25#

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