Question

Calculati: (√5-3√2+2)×(√5+3√2-2)

Answer 1

 (√5-3√2+2)×(√5+3√2-2)=12√2-17
= 5 +3√10 - 2√5 - 3√10 - 9√4 + 6√2 + 2√5 + 6√2-4=
= 5 - 9 x 2 + 6√2 + 6√2 - 4=
=12√2-17

Answer 2

=(2, 23-4, 24+2) ×(2, 23+4, 24-2)
=(-2, 01+2) ×(6, 47-2)
=-0, 01*4, 47
=−0,0447