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How do you factor $-100r^2+1$ ?

1 Answer

Jun 4, 2015

$-100r^2+1$
$color(white)("XXXX")$ could be written as
$1^2 - (10r)^2$
$color(white)("XXXX")$ and as such is the difference of squares with factors:
( $1+10r)(1-10r)$

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