Question

Calculati:(√3+√5)(3-√15)+(1-√3)²+4√3

Answer 1

3√3-√45+3√5-√75+1-2√3+3+4√3
3√3-3√5+3√5(care se reduc)-5√3+1-2√3+3+4√3
-2√3+4-2√3+4√3(-2√3, -2√3 si 4√3 se reduc)
Raspunsul este 4.

Answer 2

(a-b)(a+b)=a²-b²
3-5+1-2√3+3+4√3=2+2√3