Simplify:
《please help me armys》
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Step-by-step explanation:
2) (2root3+root5)(2root3-root5)
(a+b)(a-b)=a^2-b^2
=(2root3)^2-(root5)^2
=(4x3)-5
=12-5
=7
3)1/1+root2
=1/1+root2 x 1-root2/1-root2 (rationalising denominator)
=1-root2/1-2
=1-root2/-1
=root2-1
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