Question

rezultatul calculului (2-rad3)²-(-4+5) este...​

Answer 1

$\displaystyle{ (2 - \sqrt{3})^{2} - (4 + 5) = [2^{2} - 2 \cdot 2 \cdot \sqrt{3} + (\sqrt{3})^{2}] - 9 }$

$\displaystyle{ = (4 - 4\cdot \sqrt{3} + 9) - 9 }$

$\displaystyle{ = 4 - 4\sqrt{3} }$

$\displaystyle{ = 4 \cdot (1 - \sqrt{3}) }$