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Formula
Expand the expression
Factorize the expression
$81-4x ^{ 2 }$
$- 4 x ^ { 2 } + 81$
Organize polynomials
$\color{#FF6800}{ 81 } \color{#FF6800}{ - } \color{#FF6800}{ 4 } \color{#FF6800}{ x } ^ { \color{#FF6800}{ 2 } }$
 Sort the polynomial expressions in descending order 
$\color{#FF6800}{ - } \color{#FF6800}{ 4 } \color{#FF6800}{ x } ^ { \color{#FF6800}{ 2 } } \color{#FF6800}{ + } \color{#FF6800}{ 81 }$
$- \left ( 2 x - 9 \right ) \left ( 2 x + 9 \right )$
Arrange the expression in the form of factorization..
$\color{#FF6800}{ 81 } \color{#FF6800}{ - } \color{#FF6800}{ 4 } \color{#FF6800}{ x } ^ { \color{#FF6800}{ 2 } }$
 Factorize to use the polynomial formula of sum and difference 
$\left ( \color{#FF6800}{ 9 } \color{#FF6800}{ + } \color{#FF6800}{ 2 } \color{#FF6800}{ x } \right ) \left ( \color{#FF6800}{ 9 } \color{#FF6800}{ - } \color{#FF6800}{ 2 } \color{#FF6800}{ x } \right )$
$\left ( \color{#FF6800}{ 9 } \color{#FF6800}{ + } \color{#FF6800}{ 2 } \color{#FF6800}{ x } \right ) \left ( 9 - 2 x \right )$
 Organize the expression 
$\left ( \color{#FF6800}{ 2 } \color{#FF6800}{ x } \color{#FF6800}{ + } \color{#FF6800}{ 9 } \right ) \left ( 9 - 2 x \right )$
$\left ( 2 x + 9 \right ) \left ( \color{#FF6800}{ 9 } \color{#FF6800}{ - } \color{#FF6800}{ 2 } \color{#FF6800}{ x } \right )$
 Expand the expression 
$\left ( 2 x + 9 \right ) \left ( \color{#FF6800}{ - } \color{#FF6800}{ 2 } \color{#FF6800}{ x } \color{#FF6800}{ + } \color{#FF6800}{ 9 } \right )$
$\left ( 2 x + 9 \right ) \left ( \color{#FF6800}{ - } \color{#FF6800}{ 2 } \color{#FF6800}{ x } \color{#FF6800}{ + } \color{#FF6800}{ 9 } \right )$
 Bind the expressions with the common factor $- 1$
$\left ( 2 x + 9 \right ) \times \left ( \color{#FF6800}{ - } \left ( \color{#FF6800}{ 2 } \color{#FF6800}{ x } \color{#FF6800}{ - } \color{#FF6800}{ 9 } \right ) \right )$
$\left ( \color{#FF6800}{ 2 } \color{#FF6800}{ x } \color{#FF6800}{ + } \color{#FF6800}{ 9 } \right ) \color{#FF6800}{ \times } \left ( \color{#FF6800}{ - } \left ( \color{#FF6800}{ 2 } \color{#FF6800}{ x } \color{#FF6800}{ - } \color{#FF6800}{ 9 } \right ) \right )$
 Sort the factors 
$\color{#FF6800}{ - } \left ( \color{#FF6800}{ 2 } \color{#FF6800}{ x } \color{#FF6800}{ - } \color{#FF6800}{ 9 } \right ) \left ( \color{#FF6800}{ 2 } \color{#FF6800}{ x } \color{#FF6800}{ + } \color{#FF6800}{ 9 } \right )$
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