Question

(2-√5)(2-√5) by (2+√5)(2-√5)​

Answer 1

= (2-√5)(2-√5)/(2+√5)(2-√5)

=2(2-√5)-√5(2-√5)/(2)²-(√5)²

=4-2√5-2√5+5/4-5

=9-4√5/-1

=-9+4√5/1

=-9+4√5

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