How do you factor $25u²-49$ ?

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Answer 1 · 2016-01-13T16:13:48

The factorised form is
$color(blue)((5u-7)(5u+7)$

$25u^2 -49$

The expression can be written as
$(5u)^2 -7^2$

This is of the form :
$color(blue)(a^2-b^2 = (a-b)(a+b)$

Applying the same:
$(5u)^2 -7^2 = color(blue)((5u-7)(5u+7)$

How do you factor 25u²-4925u²-49?