Question

Rezolvati a=[(1-√7)²+(2-√7)(√7+2)-5 la puterea 0 ] * 2 la puterea -1

Answer 1

a = [ ( 1 - √7 )² + ( 2 - √7 ) ( √7 + 2 ) - 5⁰ ] x 2⁻¹

a = [ 1 - 2√7 + 7 + ( 2 - √7 ) ( 2 + √7 ) - 1 ] x 1 / 2

a = ( 1 - 2√7 + 7 + 4 - 7 - 1 )  x 1 / 2

a = ( 4 - 2√7 ) / 2

a = 2 × ( 2 - √7 ) / 2

a = 2 - √7

Answer 2

a = [(1-√7)²+(2-√7)(√7+2) -5⁰ ] * 2⁻¹

a = [ 1+7-2√7 + 4 - 7 - 1 ] * 1/2¹ =

   =  (4 - 2√7) / 2 = 2(2-√7) / 2 = 2-√7