(3√2-√3)²=(3√2)²-2.3.√2.√3 + (√3)²=18-6√6+3=21-6√6
(16-c)/(√c - 4)=(16-c)(√c+4)/(√c-4)(√c+4)=(16-c)(√c+4)/(c-16)=
=-(√c+4)=-√c-4
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(3√2-√3)²=(3√2)²-2.3.√2.√3 + (√3)²=18-6√6+3=21-6√6
(16-c)/(√c - 4)=(16-c)(√c+4)/(√c-4)(√c+4)=(16-c)(√c+4)/(c-16)=
=-(√c+4)=-√c-4