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Formula
Factorize the expression
Answer
$xy-3x-3y+9$
$\left ( x - 3 \right ) \left ( y - 3 \right )$
Arrange the expression in the form of factorization..
$\color{#FF6800}{ x } \color{#FF6800}{ y } \color{#FF6800}{ - } \color{#FF6800}{ 3 } \color{#FF6800}{ x } \color{#FF6800}{ - } \color{#FF6800}{ 3 } \color{#FF6800}{ y } \color{#FF6800}{ + } \color{#FF6800}{ 9 }$
 Do factorization 
$\color{#FF6800}{ - } \left ( \color{#FF6800}{ x } \color{#FF6800}{ - } \color{#FF6800}{ 3 } \right ) \left ( \color{#FF6800}{ 3 } \color{#FF6800}{ - } \color{#FF6800}{ y } \right )$
$\color{#FF6800}{ - } \left ( \color{#FF6800}{ x } \color{#FF6800}{ - } \color{#FF6800}{ 3 } \right ) \left ( 3 - y \right )$
 Expand the expression 
$\left ( \color{#FF6800}{ - } \color{#FF6800}{ x } \color{#FF6800}{ + } \color{#FF6800}{ 3 } \right ) \left ( 3 - y \right )$
$\left ( - x + 3 \right ) \left ( \color{#FF6800}{ 3 } \color{#FF6800}{ - } \color{#FF6800}{ y } \right )$
 Expand the expression 
$\left ( - x + 3 \right ) \left ( \color{#FF6800}{ - } \color{#FF6800}{ y } \color{#FF6800}{ + } \color{#FF6800}{ 3 } \right )$
$\left ( - x + 3 \right ) \left ( \color{#FF6800}{ - } \color{#FF6800}{ y } \color{#FF6800}{ + } \color{#FF6800}{ 3 } \right )$
 Bind the expressions with the common factor $- 1$
$\left ( - x + 3 \right ) \times \left ( \color{#FF6800}{ - } \left ( \color{#FF6800}{ y } \color{#FF6800}{ - } \color{#FF6800}{ 3 } \right ) \right )$
$\left ( \color{#FF6800}{ - } \color{#FF6800}{ x } \color{#FF6800}{ + } \color{#FF6800}{ 3 } \right ) \color{#FF6800}{ \times } \left ( \color{#FF6800}{ - } \left ( \color{#FF6800}{ y } \color{#FF6800}{ - } \color{#FF6800}{ 3 } \right ) \right )$
 Sort the factors 
$\left ( \color{#FF6800}{ x } \color{#FF6800}{ - } \color{#FF6800}{ 3 } \right ) \left ( \color{#FF6800}{ y } \color{#FF6800}{ - } \color{#FF6800}{ 3 } \right )$
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