Question

Folositi formulele: a) (a+2)totul la puterea 2. b) ( radical din 3 -1) totul la puterea 2 ???

Answer 1

$a).(a+2)^2=a^2+2 \cdot a \cdot 2+2^2=a^2+4a+4 \\ b).( \sqrt{3} -1)^2= \sqrt{3} ^2-2 \cdot \sqrt{3} \cdot 1+1^2=3-2 \sqrt{3} +1=4-2 \sqrt{3}$