Question

rationalising factor of root 75 +root 72

Answer 1

Answer:

$\sqrt{75} - \sqrt{72}$

Step-by-step explanation:

$(\sqrt{75}+\sqrt{72})*(\sqrt{75}-\sqrt{72})\\=(\sqrt{75})^{2} - (\sqrt{72})^{2} \\= 75 - 72 = 3$                       [Using (a+b)(a-b)=a²-b²]