factorise 72a^2-48b^2
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72a^2-48b^2
by using identity,
a^2-b^2=(a+b)(a-b)
therefore
(6root2)^2-(4root3)^2
(6root2 +4root3)(6root2 -4root3)
by using identity,
a^2-b^2=(a+b)(a-b)
therefore
(6root2)^2-(4root3)^2
(6root2 +4root3)(6root2 -4root3)
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