Question

calculati,utilizand formulele de calcul prescurtat

(4√2-√30)(4√2+√30)-3(√5+1)²

Answer 1

= $(4 \sqrt{2} )^{2} - ( \sqrt{30} )^{2} - 3 (5+2 \sqrt{5}+1 )= 32-30-18-6 \sqrt{5}= -16-6 \sqrt{5}$

Answer 2

32-30 -3(5+ 2√5 +1)=
2-15-6√5-3= -22-6√5
= -22-(36x5)
=-22-180
= - 202