What is the mistake in this code

Question

I made a code using JavaScript to get the square root of the number given by user using prompt. But it was showing an error.
https://code.sololearn.com/WH7yyc0ATB6J/?ref=app

Answer 1

<button onclick=" var a = prompt('Enter the number');
var b = Math.sqrt(a);
document.write(b);">Squre Root</button>

change this
you wrote "" (confusions with begining and ending "")
and had = between write and (b)
https://code.sololearn.com/WFyovatNcEKY/?ref=app

also better use js tab