Question
Factorize:-
$-4 a^2+4 a b-4 c a$

Answer

The greatest common factor of the term
$-4 a^2+4 a b$ and $4 c a$ of the expression
$-4 a^2+4 a b-4 c a$
Also, we can write $-4 a^2=(-4 a \cdot a), 4 a b=-4 a \cdot(-b)-4 c a$ and $4 c a=(-4 a \cdot c)$
Therefore, $-4 a^2+4 a b-4 c a=(-4 a \cdot a)+(-4 a \cdot(-b))-(4 a \cdot c)$
$-4 a(a-b)$

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