Calculate: 18-50u^2

Expression: $18-50{u}^{2}$

Factor out $2$ from the expression

$2\left( 9-25{u}^{2} \right)$

Use ${a}^{2}-{b}^{2}=\left( a-b \right)\left( a+b \right)$ to factor the expression

$2\left( 3-5u \right) \times \left( 3+5u \right)$