Question

please try to do this question it you know the answer then only answer ​

Answer 1

9.'s ANSWER

$\huge\boxed{\fcolorbox{green}{orange}{384}}$

Step-by-step explanation:

(20+x)²=784

20×20+x × x = 784

400+x=784

x=784-400

x=384

HOPE IT HELPS YOU