Question

$m^2-10m+21$ = $(m-7)$x.

• A. $(2m-3)$
• B. $(m+7)$
• C. $(m+3)$
• D. $(m-3)$

Answer 1

The correct option is D $(m-3)$

Given, the expression is $m^2-10m+21$.
The expression can be factorised as,
$m^2-10m+21=m^2-7m-3m+21$
= $m(m-7)-3(m-7)$
= $(m-7)(m-3)$