Question

Multiply $(x+2\sqrt{3})$ by $(x+3\sqrt{3})$

Answer 1

$(x+2\sqrt{3})(x+3\sqrt{3})$ It is in the form of $(x+a)(x+b)$
$=x^2+(2\sqrt{3}+3\sqrt{3})x+2\sqrt{3}\times 3\sqrt{3}\because (x+a)(x+b)=x^2+(a+b)x+ab$
$=x^2+5x\sqrt{3}+18$